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AUG 19, 2026

Maxon GPC Liftgate Maintenance: Daily and Annual Checks

Consistent Maxon GPC maintenance begins with separating the visual checks assigned to operators from maintenance and repair work assigned to trained personnel. The Maxon user and maintenance manual applies to the GPC 17 X-1, GPC 22 X-1, GPC 33 X-4, and GPC 44 X-4 liftgates.

The manual covers commissioning, operation, cleaning, maintenance, repair, decommissioning, disassembly, and disposal. It must remain with the liftgate or vehicle and be kept in the driver’s cab as a reference. Routine maintenance appears in a separate section from fault diagnosis and fault elimination, so routine inspection should not be treated as a substitute for troubleshooting a malfunction.

• Documentation Resources from Maxon
• Who Is Responsible for GPC Liftgate Maintenance?
• Safety Before Inspecting or Servicing the Liftgate
• Daily Visual Inspection Checklist
• Operational Checks Before Use
• Annual Inspection Requirements
• Cleaning and General Care
• Hydraulic System Inspection
• Hydraulic Oil Recommendations
• Battery and Electrical-System Care
• Inspection of Structural and Load-Bearing Components
• When the Liftgate Must Be Removed From Service
• Maxon GPC Maintenance Record Checklist
• Practical Maintenance Summary
• Conclusion

Documentation Resources from Maxon

Information in this article is sourced from Maxon GPC specification sheets, the Maxon GPC user and maintenance manual, and our team’s expertise. Always refer to the manuals for the specific liftgate, vehicle, model, and serial number before ordering equipment, selecting replacement components, or planning an installation.

Reference PDFs used:

• Maxon GPC Series Maintenance Manual

Who Is Responsible for GPC Liftgate Maintenance?

Maxon assigns responsibilities to the operating company and establishes qualification requirements for people who operate, maintain, or service the liftgate.

The operating company must comply with occupational-safety requirements and is responsible for providing personal protective equipment, including protective footwear and protective clothing, for operators and maintenance personnel. It is also responsible for the liftgate’s technically fault-free condition, annual inspections, immediate correction of defects, immediate replacement of missing parts, and prompt repair of known defects. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 15).

The liftgate may be operated, maintained, and serviced only by people who have received appropriate training and specific instruction about the associated hazards. A person who independently operates or maintains the liftgate must:

• Be at least 18 years old.
• Have been instructed in liftgate operation and maintenance.
• Have demonstrated the required capability to the operating company.
• Be expressly assigned to the work in writing. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 15).

When more than one person works on the liftgate, the operating company must appoint a supervisor. Again, remember that liftgate maintenance may be performed only by specially trained personnel. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 15).

The annual inspection must be completed by trained or qualified personnel, and the result must be entered in the inspection record book. Repairs to load-bearing components are subject to a stricter requirement: they may be completed only by an authorized repair shop, after which the components must be tested by a qualified specialist and the results entered in the inspection record book. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF pp. 15, 32–33).

Operators can therefore perform the documented daily visual checks, but maintenance, component replacement, hydraulic work, and restricted repairs must remain with personnel who meet Maxon’s stated qualifications.

Safety Before Inspecting or Servicing the Liftgate

Inspection and maintenance place personnel near electrical equipment, pressurized hydraulic components, moving structures, and crushing points. Maxon requires these hazards to be considered before work begins.

Electrical hazards

The liftgate receives power from the vehicle’s onboard electrical supply, with a maximum documented voltage of 48 V DC. Electrical components and wiring must not be damaged or modified. Excessive current can damage the battery or cable harness, so personnel should visually inspect the electrical system according to the maintenance schedule. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 13).

Work involving battery connections must be performed by trained personnel, and the vehicle manufacturer’s battery-handling instructions must be followed. Personnel must also be careful when restoring power after an interruption because an unintentional restart could injure maintenance personnel. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF pp. 33–34).

High-pressure hydraulic hazards

The hydraulic system operates at pressures up to 220 bar. Hydraulic components and hoses must not be damaged or modified because pressurized components or lines can burst and cause injury. Hydraulic components and lines must be inspected at the intervals established by the maintenance schedule. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 13).

Protective gloves must be worn when handling hydraulic fluid. Hydraulic fluid must also be handled and disposed of in accordance with local regulations. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 33).

Crushing and trapping hazards

Moving components can crush fingers or trap body parts, hair, and clothing. Personnel must watch for unexpected movement, secure long hair, and avoid loose-fitting clothing near moving parts. Liftgates with a platform foldover section also have crushing hazards around the hinges during folding and unfolding. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 13).

Before maintenance begins, the liftgate must be secured against unexpected movement. When the liftgate is operated, the vehicle must also be secured against unexpected movement. Maxon specifically identifies possible crushing and shearing areas between the platform and the vehicle cargo area and between the platform and the ground. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF pp. 16 and 32).

Modification and replacement-part restrictions

Changes to the liftgate require written permission from Maxon Construction Management. Maxon requires original spare parts for repairs and prohibits modifying, bypassing, or removing safety devices. Electrical components may be replaced only with approved original electrical components carrying EMC approval. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 34).

These restrictions apply when an inspection progresses beyond visual observation and requires adjustment, disassembly, replacement, hydraulic work, or electrical repair.

Daily Visual Inspection Checklist

Maxon provides a specific daily visual inspection list. It is narrower than a complete shop inspection and does not include every component named in the model overview diagrams.

If a defect is found, the operating company is responsible for having it corrected and for arranging prompt repair. Missing parts must be replaced immediately. Maintenance or repair work must be assigned to appropriately trained personnel. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 15).

• Operating devices are complete and functional. Check the installed operating devices for completeness and correct function. A missing, damaged, or nonfunctional device must be reported for correction. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 32).
• Safety devices are complete and functional. Confirm that the installed safety devices are present and working. Safety devices must not be modified, bypassed, or removed. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF pp. 32 and 34).
• Warning and instruction labels are legible. Check that the required labels can be read. An illegible or missing label should be reported so the operating company can arrange for correction. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF pp. 15 and 32).
• Pins are undamaged, complete, and secure. Check the pins for damage and completeness, and verify that they are securely tightened. Damaged or missing components require immediate correction or replacement. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF pp. 15 and 32).
• Cylinders and related hydraulic connections show no documented defect. Check the cylinders and check the hoses, screw connections, and valves for damage and tightness. Defects must be reported for prompt repair. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF pp. 15 and 32).
• Warning lights are undamaged and functional. Check the warning lights for damage and correct operation. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 32).
• The optional battery master switch functions correctly. When this option is installed, verify that it functions. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 32).

The daily list does not specifically require a general platform-condition inspection, mounting-bracket inspection, electrical-connection inspection, or abnormal-noise check. Those items should not be presented as Maxon's daily requirements based on this manual alone.

Electrical wiring is addressed elsewhere in the manual through a visual electrical-system inspection and checks of cable movement and chafing. Those requirements fit more appropriately within trained maintenance or scheduled shop inspection. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF pp. 13 and 32).

Operational Checks Before Use

A brief operational check can confirm whether the installed activation and operating devices function as described. It should not be expanded into a diagnostic procedure.

• Activate the liftgate using the pushbutton in the driver’s cab. The red indicator light shows that the liftgate is ready for operation. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 26).
• On the four-button membrane-switch control panel, functions are initiated by pressing two different buttons simultaneously. The operator must identify and observe the danger zone, including the danger to third parties. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 26).
• Depending on the installed configuration, the Maxon liftgate may also use an optional two-button control panel, toggle-switch control box, handheld control, or foot controls. The daily requirement is to check the completeness and function of the operating devices actually installed on the liftgate. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF pp. 10 and 32).
• The optional foot controls lower the platform to the ground and raise it to vehicle-floor height. When they are used, the platform automatically tilts to a position that is horizontal to the ground. The foot controls have priority, so the other control options are electrically locked out during foot-control operation. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 10).
• When the optional handheld control is operated from the platform or vehicle floor, the operator must stand at least 10 inches from the front edge of the platform or the rear edge of the vehicle floor. When operating from the ground, the operator must stand at least 40 inches from all platform edges and from the crushing edge between the platform and the vehicle. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 31).
• Where bridge plates are installed, they must be folded open during loading and unloading and folded closed after use. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 31).
• The platform warning lights must be functional. The manual states that the warning lights flash when the liftgate is activated so that the open platform is visible to traffic approaching from behind. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF pp. 17 and 32).

A control or warning device that is incomplete or does not operate correctly fails the documented daily check and must be reported for correction.

Annual Inspection Requirements

The annual inspection is separate from the operator’s daily visual inspection.

After commissioning, the liftgate must be inspected at least once each year by trained personnel. The result must be entered in the inspection record book. The operating company is responsible for arranging the inspection and maintaining the liftgate in a technically fault-free condition. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF pp. 15 and 32).

The maintenance manual does not reproduce the complete annual inspection procedure. Instead, it directs the reader to the inspection record book for additional maintenance and annual inspection requirements. A complete annual checklist should therefore be taken from the inspection record book supplied with the liftgate rather than reconstructed from the shorter daily-maintenance section. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF pp. 5 and 15).

The manual identifies routine inspection and service subjects that may be relevant to maintenance planning, including:

• Operating and safety devices.
• Warning and instruction labels.
• Pins.
• Cylinders, hoses, screw connections, and valves.
• Warning lights.
• The optional battery master switch.
• General screw connections.
• Cable and hose movement.
• Hydraulic-system leakage.
• Reservoir fluid level.
• Hydraulic oil and suction-filter service.
• Pressure-hose condition and age. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF pp. 32–33).

This list should not be treated as a replacement for the formal inspection-record-book procedure.

The manual states that the report for the static and dynamic inspections performed before commissioning is kept in the inspection record book. It does not state that the original commissioning load tests must be repeated annually. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 15).

Cleaning and General Care

The manual primarily defines cleaning precautions rather than prescribing a particular cleaner or a complete washing method. It does not list approved cleaning chemicals.

During cleaning:

• Do not allow moisture to penetrate the power pack.
• Do not allow moisture to penetrate the control panel.
• Do not allow moisture to penetrate the handheld control.
• Do not direct high-pressure or steam jets at the bearing areas because dirt and moisture could enter the bearings. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 32).

Warning and instruction labels must remain legible because label legibility is part of the documented daily visual inspection. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 32).

The Maxon GPC uses maintenance-free bearing points. The bearings require no lubrication throughout their service life. Technicians should therefore not add a routine greasing interval that is absent from the maintenance manual. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF pp. 5 and 10).

General care focuses on preventing moisture intrusion, maintaining legible labels, checking cable and hose movement, identifying leakage, and completing the specified hydraulic service.

Hydraulic System Inspection

Hydraulic-system maintenance includes inspection of the hydraulic unit, hoses, connections, valves, routing, and reservoir level.

• Check the hydraulic unit for leakage. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 32).
• Check the cylinder hoses, screw connections, and valves for damage and tightness during the daily inspection. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 32).
• Verify during maintenance that hoses can move freely throughout liftgate movement. Correct locations where hoses are exposed to shearing or chafing. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 32).
• Immediately replace a damaged hydraulic hose with a new hose of the same quality. Record the replacement in the inspection record book. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 32).
• Replace pressure hoses as necessary, but no later than six years. Enter pressure-hose replacements in the inspection record book. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 33).
• Do not damage or modify hydraulic components or hoses. The system operates at pressures up to 220 bar, and pressurized components or lines can burst and cause injury. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 13).

The hose-rupture valves are safety devices. If a hose, pipe, or screw connection bursts, the liftgate lowers or tilts at the permitted controlled speed only while an operating control continues to be activated. When the control is released, the liftgate stops. This safety device description is not a repair procedure, and a burst or damaged component still requires qualified service. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 14).

Hydraulic Oil Recommendations

Maxon specifies the reservoir-check position, fluid instructions, annual oil-change interval, and suction-filter service.

Reservoir check

Check the reservoir with the liftgate lowered. Use the dipstick on the oil-filler-neck cover. The manual states that the maximum oil level is reached when the dipstick extends 3/8 inch into the oil. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 32).

Hydraulic-fluid instruction

Technicians must top up with HLPD 22 hydraulic fluid and give a temperature range of 5°F to 122°F. The hydraulic-fluid recommendation identifies HLPD 22 as ISO-VG 22 detergent fluid and states that it keeps free water emulsified, including to help prevent ice formation in winter, while improving oil-film adhesion. In colder regions, the manual directs the use of HLPD 10-grade hydraulic fluid. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF pp. 32–33).

Fluid selection should be confirmed against the exact manual supplied with the liftgate and, where necessary, with Maxon technical service. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 33).

Oil and filter service

Change the hydraulic oil annually and clean the suction filter during the oil change. The oil change must be completed before a period of frost to prevent the hydraulic unit from freezing. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 32).

Wear protective gloves when handling hydraulic fluid, and handle and dispose of it according to local requirements. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 33).

Battery and Electrical-System Care

Electrical maintenance centers on adequate voltage, suitable battery capacity, cable condition, correct fuse values, and protection of the electric motor.

The battery capacity required for liftgate operation is normally specified by the vehicle manufacturer, and the vehicle manufacturer’s installation guidelines must be followed. Maxon strongly recommends a heavy-duty alternator and an additional battery. The operating company is responsible for battery capacity and charge status. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 34).

The manual provides the following battery-capacity recommendations:

(Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 34).

Electrical components and wiring must be visually inspected and must not be damaged or modified. During maintenance, verify that cables can move freely and correct locations where cables are exposed to shearing or chafing. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF pp. 13 and 32).

When batteries appear to discharge too quickly, the user should have the batteries and the cables to the power pack inspected by a specialist. Repair or replacement of the cables, ground connection, or batteries may be necessary. The charging intervals between loading and unloading operations must also be sufficient. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 35).

A defective fuse may be replaced only with a fuse matching the value shown in the circuit diagram and on the control unit. Maxon warns that a larger fuse might not respond to a malfunction and could allow cables to catch fire. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 14).

Low voltage increases the current drawn by the electric motor. Depending on liftgate capacity, the power-pack motor is rated from 0.8 kW to 3 kW. Low voltage and high current can overheat the copper windings, damage their protective coating, and result in a short circuit or motor burnout. If the motor has difficulty lifting a load that is normally easy to lift, the lifting operation must be stopped immediately and the batteries charged. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 35).

The fault-support table also identifies low voltage as a possible cause when the liftgate does not lift or does not lift its rated load. Detailed diagnosis remains outside this preventive-maintenance article. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 38).

Inspection of Structural and Load-Bearing Components

The four models have different component arrangements, although the manual gives them the same core daily and annual maintenance requirements.

• The GPC 17 X-1 overview identifies a platform, torsion box, lifting arm, lifting cylinder, closing arm, closing cylinder, compact power unit, underbody impact guard, mounting bracket, where applicable, axle assembly, controls, warning lights, and related equipment. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 6).
• The GPC 22 X-1 overview identifies the same general types of components, including the platform, lifting and closing mechanisms, compact power unit, underbody impact guard, mounting bracket, axle assembly, and controls. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 7).
• The GPC 33 X-4 overview identifies left- and right-side lifting gear, lifting and closing cylinders, an axle assembly, an underbody impact guard, mounting brackets, and a compact power unit integrated into the axle assembly. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 8).
• The GPC 44 X-4 overview identifies left- and right-side lifting gear, lifting and closing cylinders, an underbody impact guard, mounting brackets, an axle assembly, a power unit integrated into the axle assembly, and a platform with an integrated torsion box. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 9).

These diagrams identify the component arrangements but do not classify every illustrated component as a load-bearing component.

During maintenance, check that screw connections are tight. The daily inspection separately requires checks of pins, cylinders, hoses, screw connections, valves, operating devices, and safety devices. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 32).

Repairs to components identified as load-bearing may be performed only by an authorized repair shop. After repair, the components must be tested by a qualified specialist, and the result must be entered in the inspection record book. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 33).

After the breakage of a load-carrying device, the supporting structures and power pack, including the safety devices, must be inspected, and damaged components must be replaced. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 33).

The manual does not authorize an operator or an unqualified shop employee to straighten, weld, reinforce, or otherwise repair a load-bearing component.

When the Liftgate Must Be Removed From Service

The manual does not provide one consolidated “remove from service” table. It instead provides an emergency instruction, immediate defect-correction requirements, and specific procedures for certain dangerous malfunctions.

Conditions with explicit stop or emergency instructions

• In any dangerous situation, immediately stop the activity and seek expert help. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 14).
• If the electric motor operates continuously and the liftgate cannot be switched off, trained personnel must interrupt the battery contact or use the battery master switch and arrange repair. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 39).
• If an open liftgate has been lifted or closed mechanically rather than hydraulically, air can enter the hydraulic cylinders and leave the solenoid safety valves inoperative. The liftgate must be secured with ropes, straps, or chains and marked with a clear warning notice. The platform must be secured against opening; the vehicle may be driven no farther than the repair shop, and the platform may be opened only with the aid of a crane or forklift. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 40).
• If the platform tilts down independently without the function being activated, the manual identifies a defective closing-cylinder solenoid valve as a possible cause. This is a malfunction requiring service rather than continued normal operation. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 38).

Defects requiring immediate correction

Maxon requires defects to be corrected, missing parts to be replaced immediately, and known defects to be repaired promptly. This requirement applies to documented inspection defects such as:

• Incomplete or nonfunctional operating or safety devices.
• Missing, damaged, incomplete, or insecure pins.
• Damaged cylinders, hoses, screw connections, or valves.
• Damaged or nonfunctional warning lights.
• A nonfunctional optional battery master switch.
• Damaged hydraulic hoses.
• Hydraulic leakage.
• Damaged electrical components or wiring.
• Damage to a load-bearing component. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF pp. 15, 32–34).

Until a defect that affects safe operation has been corrected by appropriately qualified personnel, the liftgate should not be treated as being in the technically fault-free condition required by Maxon and may fail to comply with the requirements for a warranty claim.

Maxon GPC Maintenance Record Checklist

Maxon expressly requires several items to be entered in the inspection record book:

• Annual inspection results.
• Pressure-hose replacements.
• Qualified specialist test results after repairs to load-bearing components.
• Bearing-nut and secondary-nut replacements where those components apply. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF pp. 15 and 33).

The following broader checklist is a suggested internal fleet record. The manual does not prescribe this exact form or expressly require every field:

• Service or inspection date
• Vehicle identification
• Liftgate model
• Liftgate serial number
• Daily inspection defect report
• Description of the defect
• Annual inspection date and result
• Inspector or technician
• Hydraulic oil-change date
• Suction-filter cleaning
• Hydraulic-fluid designation used
• Hydraulic-hose replacement date
• Repair performed
• Replacement parts installed
• Authorized repair shop, where required
• Qualified specialist test result, where required
• Internal return-to-service authorization

The serial number is required for technical support, spare parts orders, and warranty claims. These can be found in either of these three locations:

• On the rating plate affixed to the right-side closing arm, viewed in the direction of travel.
• On the rating plate inside the power-pack cover.
• Stamped into the left mounting flange, viewed in the direction of travel. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF p. 11).

Recording the exact model and serial number helps distinguish the applicable Maxon GPC liftgate parts and documentation, but the specific replacement part must still be verified against the correct Maxon parts information.

Practical Maintenance Summary

The following lists organize the manual’s requirements by operator inspection, scheduled maintenance, and annual activity.

Before each operating period or daily

• Check the completeness and function of operating devices.
• Check the completeness and function of safety devices.
• Confirm that warning and instruction labels are legible.
• Inspect pins for damage, completeness, and secure tightening.
• Inspect cylinders and check hoses, screw connections, and valves for damage and tightness.
• Check warning lights for damage and function.
• Check the optional battery master switch, where installed.
• Report defects and missing parts for immediate correction. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF pp. 15 and 32).

During the scheduled shop inspection

• Secure the liftgate against unexpected movement.
• Check screw connections for tightness.
• Verify that cables and hoses can move freely.
• Correct cable and hose shearing or chafing points.
• Check the hydraulic unit for leakage.
• Replace damaged hydraulic hoses immediately with hoses of the same quality.
• Check the reservoir level with the liftgate lowered.
• Protect the power pack and controls against moisture during cleaning.
• Do not direct high-pressure or steam jets at bearing areas.
• Check pressure-hose age against the six-year maximum interval.
• Visually inspect electrical components and wiring.
• Check the battery and power-pack cables if the batteries discharge too quickly.
• Use original spare parts and approved original electrical components where required.
• Complete the required inspection-record-book entries. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF pp. 13 and 32–35).

During the annual inspection

• Have trained personnel inspect the liftgate at least once each year.
• Follow the additional requirements in the applicable inspection record book.
• Enter the annual inspection result in the inspection record book.
• Complete the separately required annual hydraulic oil change.
• Clean the suction filter during the oil change.
• Complete the oil change before a period of frost.
• Verify that pressure-hose replacements and restricted repair tests have been recorded where applicable. (Maxon-GPC-Series-Maintenance-Manual-rev-12-2020.pdf, PDF pp. 15 and 32–33).

The annual oil service is an annual maintenance requirement, although the manual does not state that it must occur during the same appointment as the formal annual inspection.

Conclusion

A documented Maxon GPC maintenance program starts with the operator’s daily checks of controls, safety devices, labels, pins, cylinders, hydraulic connections, warning lights, and the optional battery master switch. Trained maintenance personnel are responsible for the broader work involving fasteners, cable and hose routing, hydraulic leakage, oil level, annual hydraulic service, pressure-hose replacement, electrical condition, and restricted repairs.

Keep the exact Maxon manual and inspection record book with the vehicle, and record the correct model and serial number when arranging service or identifying liftgate parts.

For assistance locating documented Maxon replacement parts for a specific GPC model, contact the LiftGateMe team with the liftgate model and serial number so the applicable part information can be verified. You can do so at parts@liftgateme.com or by calling (774) 266-8892