Thieman M 16ET / 20ET Liftgate Parts Diagrams
Thieman M 16ET / 20ET liftgate parts lookup
Use this Thieman M 16ET / 20ET liftgate parts diagram page to identify OEM components, review part callouts, and verify replacement liftgate parts.
Compatibility and Purchasing Notice
Although the information on this page is taken from an OEM lift gate manual, if you're unsure whether this data matches your exact model and year, PLEASE contact our team. Part numbers can vary by year - even within the same model - and we're always happy to confirm the correct parts for you.
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i
DECAL MAINTENANCE - INSPECTION AND LOCATION OF DECALS
| Item | Qty | Part Number | Description | Actions |
|---|---|---|---|---|
| 1 | 4671050 | Warning Decal-off center | ||
| 2 | 4650150 | Fast Idle Decal | ||
| 2 | 4650140 | PTO Decal | ||
| 3 | 4609 | Danger Decal-no riding | ||
| 4 | 4650890 | Operating Decal | ||
| 5 | 4650750 | Capacity Decal-1600# | ||
| 5 | 4650100 | Capacity Decal-2000# | ||
| 6 | 4604 | Warning Decal-pinch point | ||
| 7 | 4605 | Handle Decal | ||
| 8 | 4650800 | Thieman Nameplate | ||
| 9 | 4650530 | Urgent Warning Decal | ||
| 10 | 5705 | Reflector (3) | ||
| 11 | 4612 | Wiring Decal-Gravity Down | ||
| 11 | 4614 | Wiring Decal-Power Down | ||
| 12 | 4620 | Warning Decal | ||
| 13 | 4650770 | Caution Decal | ||
| 14 | 4683 | Receiver Latch Decal (Optional) |
Reference Notice
Manual links are provided for reference only. If you have any doubt, contact us — we’re happy to verify parts and help you purchase with confidence.
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PLATFORM ASSEMBLY (STEEL MAIN/EXT.) - 32+5, 32+6, 42+6
| Item | Qty | Part Number | Description | Actions |
|---|---|---|---|---|
| 1 | 1 | 3421-001 | Platform Asm 7232 | |
| 1 | 1 | 3421-002 | Platform Asm 8432 | |
| 1 | 1 | 3423-001 | Platform Asm 7236 | |
| 1 | 1 | 3423-002 | Platform Asm 8436 | |
| 1 | 1 | 3475-001 | Platform Asm 7242 | |
| 1 | 1 | 3475-002 | Platform Asm 8442 | |
| 2 | 1 | 31222-001 | Main Section Weld 7232 | |
| 2 | 1 | 31222-002 | Main Section Weld 8432 | |
| 2 | 1 | 31224-001 | Main Section Weld 7236 | |
| 2 | 1 | 31224-002 | Main Section Weld 8436 | |
| 2 | 1 | 31830-001 | Main Section Weld 7242 | |
| 2 | 1 | 31830-002 | Main Section Weld 8442 | |
| 3 | 1 | 31717-001 | Extension Weld 7232 | |
| 3 | 1 | 31717-002 | Extension Weld 8432 | |
| 3 | 1 | 31097-001 | Extension Weld 7236 | |
| 3 | 1 | 31097-002 | Extension Weld 8436 | |
| 3 | 1 | 31678-001 | Extension Weld 7242 | |
| 3 | 1 | 31678-002 | Extension Weld 8442 | |
| 4 | 1 | 3023-001 | Support Tube | |
| 5 | 2 | 5101260 | Spring-M or MLB | |
| 6 | 1 | 5050 | Pin | |
| 7 | 1 | 8120378 | Nut .50 | |
| 8 | 1 | 9414074 | Locknut .50 | |
| 9 | 5 | 5781017 | Retaining Ring | |
| 10 | 1 | 5051 | Pin | |
| 11 | 2 | 5056 | Pin | |
| 12 | 1 | 5711 | Shoulder Eye Bolt | |
| 13 | 2 | 8107-011 | Washer .62 | |
| 14 | 4 | 5504-022 | Bushing |
PLATFORM ASSEMBLY - 38W, 42W (STEEL MAIN/EXT.)
| Item | Qty | Part Number | Description | Actions |
|---|---|---|---|---|
| 1 | 1 | 3473-001 | Platform Asm 7238W | |
| 1 | 1 | 3473-002 | Platform Asm 8438W | |
| 1 | 1 | 3422-001 | Platform Asm 7242W | |
| 1 | 1 | 3422-002 | Platform Asm 8442W | |
| 2 | 1 | 31222-001 | Main Section Weld 7238W | |
| 2 | 1 | 31222-002 | Main Section Weld 8438W | |
| 2 | 1 | 31224-001 | Main Section Weld 7242W | |
| 2 | 1 | 31224-002 | Main Section Weld 8442W | |
| 3 | 1 | 31155-001 | Extensioni Weld 7238W/7242W | |
| 3 | 1 | 31155-002 | Extension Weld 8438W/8442W | |
| 4 | 1 | 3023-001 | Support Tube | |
| 5 | 2 | 5101260 | Spring-M or MLB | |
| 6 | 1 | 5050 | Pin | |
| 7 | 1 | 8120378 | Nut .50 | |
| 8 | 1 | 9414074 | Locknut .50 | |
| 9 | 5 | 5781017 | Retaining Ring | |
| 10 | 1 | 5051 | Pin | |
| 11 | 2 | 5056 | Pin | |
| 12 | 1 | 5711 | Shoulder Eye Bolt | |
| 13 | 2 | 8107-011 | Washer .62 | |
| 14 | 4 | 5504-022 | Bushing |
Reference Notice
Manual links are provided for reference only. If you have any doubt, contact us — we’re happy to verify parts and help you purchase with confidence.
Have your liftgate serial number ready for faster assistance. Where to find it
PLATFORM ASSEMBLY - 42+10 RET. (STEEL MAIN/EXT.)
| Item | Qty | Part Number | Description | Actions |
|---|---|---|---|---|
| 1 | 1 | 3464-001 | Platform Asm 7242+10 RET | |
| 1 | 1 | 3464-002 | Platform Asm 8442+10 RET | |
| 2 | 1 | 31224-001 | Main Section Weld 7242+10 RET | |
| 2 | 1 | 31224-002 | Main Section Weld 8442+10 RET | |
| 3 | 1 | 31654-001 | Extension Weld 7242+10 RET | |
| 3 | 1 | 31654-002 | Extension Weld 8442+10 RET | |
| 4 | 1 | 31655-001 | Ramp Asm 7242+10 RET | |
| 4 | 1 | 31655-002 | Ramp Asm 8442+10 RET | |
| 5 | 1 | 3023-001 | Support Tube | |
| 6 | 2 | 5101260 | Spring | |
| 7 | 1 | 5050 | Pin | |
| 8 | 1 | 8120378 | Nut .50 | |
| 9 | 1 | 9414074 | Locknut .50 | |
| 10 | 9 | 5781017 | Retaining Ring | |
| 11 | 1 | 5051 | Pin | |
| 12 | 4 | 5056 | Pin | |
| 13 | 1 | 5711 | Shoulder Eye Bolt | |
| 14 | 4 | 5504-022 | Bushing | |
| 15 | 2 | 5746 | Cable | |
| 16 | 2 | 8180126 | Screw .38 x 1.50 | |
| 17 | 1 | 8180122 | Screw .38 x 1.00 | |
| 18 | 2 | 9413534 | Locknut .38 | |
| 19 | 4 | 8107-011 | Washer .62 | |
| 20 | 2 | 5708-001 | Spring Pin | |
| 21 | 1 | 27215 | Retainer | |
| 22 | 1 | 8109-008 | .25 Set Screw |
PLATFORM ASSEMBLY - 27+6, 36+6, 40+6 (ALUM. MAIN/EXT.)
| Item | Qty | Part Number | Description | Actions |
|---|---|---|---|---|
| 1 | 1 | 3474-001 | Platform Asm 7227+6 | |
| 1 | 1 | 3474-002 | Platform Asm 8427+6 | |
| 1 | 1 | 3439-001 | Platform Asm 7236+6 | |
| 1 | 1 | 3439-002 | Platform Asm 8436+6 | |
| 2 | 1 | 31743-001 | Platform Asm 7240+6 | |
| 2 | 1 | 31743-002 | Platform Asm 8440+6 | |
| 2 | 1 | 31826-001 | Main Section Weld 7227+6 | |
| 2 | 1 | 31826-002 | Main Section Weld 8427+6 | |
| 2 | 1 | 31345-001 | Main Section Weld 7236+6 | |
| 2 | 1 | 31345-002 | Main Section Weld 8436+6 | |
| 2 | 1 | 31744-001 | Main Section Weld 7240+6 | |
| 2 | 1 | 31744-002 | Main Section Weld 8440+6 | |
| 3 | 1 | 31829-001 | Extension Weld 7227+6 | |
| 3 | 1 | 31829-002 | Extension Weld 8427+6 | |
| 3 | 1 | 31346-001 | Extension Weld 7236+6 | |
| 3 | 1 | 31346-002 | Extension Weld 8436+6 | |
| 3 | 1 | 31745-001 | Extension Weld 7240+6 | |
| 3 | 1 | 31745-002 | Extension Weld 8440+6 | |
| 4 | 1 | 3023-001 | Support Tube | |
| 5 | 1 | 5101260 | Spring | |
| 6 | 1 | 5050 | Pin | |
| 7 | 1 | 8120378 | Nut .50 | |
| 8 | 1 | 9414074 | Locknut .50 | |
| 9 | 5 | 5781017 | Retaining Ring | |
| 10 | 1 | 5051 | Pin | |
| 11 | 2 | 8107-011 | Washer .62 | |
| 12 | 1 | 5711 | Should Eye Bolt | |
| 13 | 2 | 5056 | Pin | |
| 14 | 4 | 5504-021 | Bushing |
Reference Notice
Manual links are provided for reference only. If you have any doubt, contact us — we’re happy to verify parts and help you purchase with confidence.
Have your liftgate serial number ready for faster assistance. Where to find it
PLATFORM ASSEMBLY - 37W (ALUM. MAIN/EXT.)
| Item | Qty | Part Number | Description | Actions |
|---|---|---|---|---|
| 1 | 1 | 3472-001 | Platform Asm 7237W | |
| 1 | 1 | 3472-002 | Platform Asm 8437W | |
| 2 | 1 | 31826-001 | Main Section Weld 7237W | |
| 2 | 1 | 31826-002 | Main Section Weld 8437W | |
| 3 | 1 | 31828-001 | Extension Weld 7237W | |
| 3 | 1 | 31828-002 | Extension Weld 8437W | |
| 4 | 1 | 3023-001 | Support Tube | |
| 5 | 1 | 5101260 | Spring | |
| 6 | 1 | 5050 | Pin | |
| 7 | 1 | 8120378 | Nut .50 | |
| 8 | 1 | 9414074 | Locknut .50 | |
| 9 | 5 | 5781017 | Retaining Ring | |
| 10 | 1 | 5051 | Pin | |
| 11 | 2 | 8107-011 | Washer .62 | |
| 12 | 1 | 5711 | Shoulder Eye Bolt | |
| 13 | 2 | 5056 | Pin | |
| 14 | 4 | 5504-021 | Bushing |
SPACER ASSEMBLY
| Item | Qty | Part Number | Description | Actions |
|---|---|---|---|---|
| 1 | 1 | 3500-001 | Spacer Asm - 96" | |
| 1 | 1 | 3500-002 | Spacer Asm - 102" | |
| 2 | 1 | 2404-002 | Control Shaft - 96" Spacer Asm | |
| 2 | 1 | 2404-003 | Control Shaft - 102" Spacer Asm | |
| 3 | 1 | 31592 | Latch | |
| 4 | 1 | 5101100 | Spring | |
| 5 | 1 | 5701043 | Handle | |
| 6 | 1 | 23168-005 | Flat Bar |
Reference Notice
Manual links are provided for reference only. If you have any doubt, contact us — we’re happy to verify parts and help you purchase with confidence.
Have your liftgate serial number ready for faster assistance. Where to find it
TRUNNION, LIFT ARM, AND IDLER ARMS - M16/20
| Item | Qty | Part Number | Description | Actions |
|---|---|---|---|---|
| 1 | 1 | 31422-001 | Trunnion Weld-M | |
| 1 | 1 | 31422-002 | Trunnion Weld-MLB | |
| 1 | 1 | 31422-003 | Trunnion Weld-Pintle Bracket | |
| 2 | 2 | 21026 | Mounting Plate | |
| 3 | 2 | 31234 | Idler Arm | |
| 4 | 1 | 31424 | Lift Arm-M16/20 | |
| 4 | 1 | 31429 | Lift Arm-M20 Pintle Bracket | |
| 5 | 1 | 31232 | Pivot Bar Weld-Standard M | |
| 5 | 1 | 31233 | Pivot Bar Weld-Wedge & MLB | |
| 5 | 1 | 31827 | Pivot Bar Weld 37 & 38 Wedge & MLB | |
| 6 | 1 | 5701330 | Roller | |
| 7 | 1 | 5031 | Pin | |
| 8 | 2 | 5781008 | Retaining Ring | |
| 9 | 1 | 8271291 | Zerk | |
| 10 | 4 | 5047 | Pin | |
| 11 | 4 | 5702371 | Spring Pin | |
| 12 | 2 | 5049 | Pin | |
| 13 | 6 | 5504-005 | Bushing | |
| 14 | 4 | 5708-001 | Spring Pin | |
| 15 | 2 | 5504-018 | Bushing | |
| 16 | 2 | 5504-022 | Bushing |
i
PUMP ASSEMBLY-POWER DOWN - M16/20
| Item | Qty | Part Number | Description | Actions |
|---|---|---|---|---|
| 1 | 1 | 4404 | Pump Asm-Items 2 to 6 | |
| 2 | 1 | 4421420 | Pump Bracket | |
| 3 | 1 | 4421350 | Mounting Bracket | |
| 4 | 1 | 4423520 | Motor 8111 | |
| 5 | 1 | 4468 | Solenoid Start Switch | |
| 6 | 1 | 4420410 | Breather Cap | |
| 7 | 1 | 5704 | Cover | |
| 8 | 1 | 5700100 | Strap | |
| 9 | 3 | 4930-001 | MF-MAORB 90° | |
| 10 | 1 | 4948-001 | Flow Control - 1.5 GPM | |
| 11 | 1 | 4936-001 | MAORB-MAORB 90° | |
| 12 | 1 | 5053 | Pin | |
| 13 | 1 | 4299 | Cylinder Asm-M16//20/25, M16 Wedge | |
| 13 | 1 | 4298 | Cylinder Asm-M20/25 Wedge, M30 | |
| 14 | 1 | 4300030 | Battery Cable #2 X 25’ | |
| 15 | 1 | 4350 | Cable Lug | |
| 16 | 5 | 8180126 | Screw .38 x 1.50 | |
| 17 | 10 | 8106-010 | Internal Tooth Lockwasher .38 | |
| 18 | 5 | 8120377 | Nut .38 | |
| 19 | 4 | 8120388 | Flatwasher .38 | |
| 20 | 1 | 31445 | Toggle Switch Assembly | |
| 21 | 2 | 5504-001 | Bushing | |
| 22 | 1 | 4422860 | Pushbutton Control-Optional | |
| 23 | 2 | 8111-005 | Screw #10X .75 | |
| 24 | 1 | 4318-002 | Ground Cable #2 x 2' | |
| 25 | 1 | 8104-006 | Screw .31 x 1 | |
| 26 | 1 | 5702371 | Spring Pin | |
| 27 | 1 | 5059 | Pin | |
| 28 | 2 | 5781008 | Retaining Ring | |
| 29 | 2 | 4951-012 | Hose 38" | |
| 30 | 1 | 4301770 | Circuit Breaker 150 Amp | |
| 31 | 1 | 4318-001 | Battery Cable #2 x 2’ | |
| 32 | 1 | 4319-002 | Shrink Wrap | |
| 33 | 1 | 4941-001 | MJ-MORB Straight |
Reference Notice
Manual links are provided for reference only. If you have any doubt, contact us — we’re happy to verify parts and help you purchase with confidence.
Have your liftgate serial number ready for faster assistance. Where to find it
PUMP ASSEMBLY-GRAVITY DOWN - M16/20
| Item | Qty | Part Number | Description | Actions |
|---|---|---|---|---|
| 1 | 1 | 4400351 | Pump Asm-Items 2 to 6 | |
| 2 | 1 | 4421420 | Pump Bracket | |
| 3 | 1 | 4421350 | Mounting Bracket | |
| 4 | 1 | 4423520 | Motor 8111 | |
| 5 | 1 | 4468 | Solenoid Start Switch | |
| 6 | 1 | 4420410 | Breather Cap | |
| 7 | 1 | 5704 | Cover | |
| 8 | 1 | 5700100 | Strap | |
| 9 | 1 | 4930-001 | MJ-MAORB 90° | |
| 10 | 1 | 4951-012 | Hose 38" | |
| 11 | 1 | 4948-001 | Flow Control 1.5 GPM | |
| 12 | 1 | 4936-001 | MAORB-MAORB 90° | |
| 13 | 1 | 5053 | Pin | |
| 14 | 1 | 4299 | Cylinder Asm | |
| 15 | 1 | 4300030 | Battery Cable #2 x 25’ | |
| 16 | 1 | 4350 | Cable Lug | |
| 17 | 5 | 8180126 | Screw .38 x 1.50 | |
| 18 | 10 | 8106-010 | Internal Tooth Lockwasher .38 | |
| 19 | 5 | 8120377 | Nut .38 | |
| 20 | 4 | 8120388 | Flatwasher .38 | |
| 21 | 2 | 4933-001 | Tube Elbow BT-MAOPB | |
| 22 | 1 | 31446 | Toggle Switch ASM | |
| 23 | 2 | 5504-001 | Bushing | |
| 24 | 2 | 8111-005 | Screw #10 x .75 | |
| 25 | 1 | 4422850 | Pushbutton Control-Optional | |
| 26 | 1 | 4318-002 | Ground Cable #2 x 2' | |
| 27 | 1 | 8104-006 | Screw .31 x 1 | |
| 28 | 1 | 5059 | Pin | |
| 29 | 1 | 5702371 | Spring Pin | |
| 30 | 2 | 5781008 | Retaining Ring | |
| 31 | 1 | 4301770 | Circuit Breaker 150 Amp | |
| 32 | 1 | 4318-001 | Battery Cable #2 x 2’ | |
| 33 | 1 | 4319-002 | Shrink Wrap | |
| 34 | 1 | 4941-001 | MJ-MAORB Straight | |
| 35 | 1 | 4921-005 | Tubing 30.00 |
4404 PUMP PARTS
| Item | Qty | Part Number | Description | Actions |
|---|---|---|---|---|
| 1 | 1 | 4423520 | Motor 8111 | |
| 2 | 1 | 4439 | Pump and Reservoir Only | |
| 3 | 1 | 4420410 | Breather Cap | |
| 4 | 1 | 4480 | Buss Bar | |
| 5 | 1 | 4421520 | Bearing | |
| 6 | 1 | 4421530 | Seal | |
| 7 | 2 | 8109-012 | Screw .25 x .75 | |
| 8 | 1 | 4421420 | Bracket | |
| 9 | 1 | 4468 | Solenoid | |
| 10 | 2 | 4421600 | O-Ring | |
| 11 | 2 | 4452 | Solenoid Coil Only | |
| 12 | 1 | 4445 | Solenoid Valve Asm (lower) | |
| 13 | 1 | 4438 | Solenoid Valve Asm (raise) | |
| 14 | 1 | 4457 | Reservoir Ø4.50 x 12.00 | |
| 15 | 6 | 4421660 | Self Tap Screw #10 x .38 |
Reference Notice
Manual links are provided for reference only. If you have any doubt, contact us — we’re happy to verify parts and help you purchase with confidence.
Have your liftgate serial number ready for faster assistance. Where to find it
4400351 PUMP PARTS
| Item | Qty | Part Number | Description | Actions |
|---|---|---|---|---|
| 1 | 1 | 4423520 | Motor 8111 | |
| 2 | 1 | 4400359 | Pump and Reservoir Only | |
| 3 | 1 | 4420410 | Breather Cap | |
| 4 | 1 | 4403 | Reservoir ø6 x 9 | |
| 5 | 1 | 4421520 | Bearing | |
| 6 | 1 | 4421530 | Seal | |
| 7 | 1 | 4421350 | Bracket | |
| 8 | 1 | 4421420 | Bracket | |
| 9 | 1 | 4480 | Buss Bar | |
| 10 | 1 | 4468 | Solenoid | |
| 11 | 1 | 4421600 | O-Ring | |
| 12 | 2 | 8109-009 | Screw .25 x 1.38 | |
| 13 | 1 | 4445 | Valve Asm | |
| 14 | 1 | 4452 | Coil Only | |
| 15 | 6 | 4421660 | Self Tap Screw #10 x .38 |
SNUBBER KIT 172
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Contact SupportImportant Diagram Notice
These diagrams are for reference only.
- Due to unintended occasional data alignment issues, a page table may differ slightly from the original OEM PDF.
- Please verify details against the original PDF file.
- Contact our team anytime for part number confirmation.
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