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All about Waltco SG Series Liftgate

The Waltco SG Side Loader is a specialized side loader liftgate designed for applications where loading and unloading occurs through a side door rather than the rear of the vehicle.

Important note: This model is no longer manufactured, but OEM parts and service information remain available.

While SG-specific documentation is limited, the manufacturer confirms that SG models follow a similar design and operation to Waltco flipaway liftgates, so many service procedures and components are comparable. The primary difference is installation location—mounted on the side of the vehicle instead of the rear. This means operation, hydraulics, and parts follow standard C-Series documentation.

Key Features and Design Advantages

The SG side loader was built for durability and ease of use in tight delivery environments.

Core features include:

• 2,000 lb lifting capacity, designed for consistent side-loading applications
• Rugged steel half-dip platform design for strength and stability
• Power up / gravity down hydraulic system for controlled lifting and lowering
• Mid-arm lift design to balance strength and reduced unit weight
• Torsion spring assist to simplify platform folding and unfolding

Additional durability and maintenance-focused features include:

• Closed-loop hydraulic system to reduce contamination risk
• Weather-protected power unit enclosure
• Powder coat finish with zinc primer for corrosion resistance
• Factory pre-mounted power unit for simplified installation

These features make the SG a reliable solution for delivery routes requiring frequent side access.

Platform and Fitment Options

The SG Series was offered with multiple platform sizes to match different vehicle configurations.

Typical configurations include:

• 32" x 45" platform
• 32" x 54" platform
• 32" x 72" platform
• 32" x 84" platform
• 4" ramp extension
• Bed height range: approximately 40"–52"

This range allowed operators to tailor the liftgate to specific truck bodies and loading needs.

How the SG Side Loader Operates

Because the SG uses the same system as Waltco C-Series liftgates, its operation follows standard flipaway liftgate functionality.

Basic Operation

• The operator uses a control switch to raise and lower the platform
• Loads should be positioned evenly and close to the vehicle
• The platform folds and stores securely when not in use

Hydraulic System

The SG utilizes a hydraulic cylinder and pump system with two possible configurations:

• Gravity down system (standard)
• Optional power down system for controlled lowering

Lowering speed is controlled by a pressure-compensated flow control valve, ensuring consistent descent regardless of load weight.

Installation Considerations (Side Loader Application)

Unlike traditional rear-mounted liftgates, the SG is installed on the side of the vehicle body, which affects placement and workflow.

Key installation requirements (based on C-Series guidelines):

• Proper mount frame alignment and clearance must be maintained
• Liftgate must be centered relative to the mounting point
• Installation should be performed by qualified technicians only

The installation process—including hydraulic routing, mounting plates, and wiring—follows standard C-Series procedures, even though the mounting orientation differs. Find liftgate installation near you.

Maintenance and Service Notes

Routine maintenance for the SG follows the same guidelines as C-Series liftgates.

Recommended maintenance intervals:

• Inspect every 6 months or 3,000 cycles
• Check for:
• Structural damage or cracked welds
• Loose fasteners and worn bearings
• Hydraulic leaks and fluid levels
• Proper operation of controls and safety components

Lubrication:

• Perform every 120 days using light machine oil
• Bearings are non-greaseable but can be treated to reduce corrosion

Using OEM Waltco parts is critical for safety and compatibility.

Why the Waltco SG Side Loader Still Matters

Even though the Waltco SG Side Loader is discontinued, it remains widely used in fleets that rely on side access delivery setups.

Because it shares its design with the C-Series:

• Parts are still identifiable and serviceable
• Technicians can reference C-Series manuals for troubleshooting and repairs
• Operators benefit from a proven, standardized liftgate system

Frequently Asked Questions