Overview
The ZF 8605.955.132 PISTON PUMP is a critical hydraulic component engineered specifically for the WG150 series transmission. This OEM genuine part generates the necessary fluid pressure to actuate clutch packs and modulate gear shifts within the transmission housing. As the heart of the hydraulic control system, the SKU 8605.955.132 ensures consistent oil flow to the valve body and torque converter. When installed alongside the 4642101109: TRANSMISSION HOUSING or the 4642301205: TRANSMISSION HOUSING, this pump maintains the precise lubrication and cooling required for heavy-duty industrial applications. Its robust construction withstands high cyclic loads, making it a cornerstone of reliable transmission performance.
Symptoms of Failure
- Erratic shifting or gear slipping: A worn piston pump cannot sustain adequate hydraulic pressure, causing delayed or harsh engagement between gears.
- Low transmission fluid pressure warnings: Internal wear reduces volumetric efficiency, triggering dashboard alerts or diagnostic trouble codes.
- Audible whining or grinding from the transmission: Cavitation or damaged pump vanes produce distinct noises during acceleration or load changes.
- Overheating fluid and thermal degradation: Insufficient flow from a failing pump leads to elevated operating temperatures and burnt fluid odor.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 8605.955.132 |
| Type | Piston Pump (Fixed Displacement) |
| Material | Hardened Steel Rotor / Aluminum Housing |
| Weight | 2.8 kg (6.2 lbs) |
| Dimensions (L x W x H) | 180 mm x 95 mm x 85 mm |
| Operating Pressure Range | 12–25 bar (174–363 psi) |
| Flow Rate | 18 L/min @ 2000 RPM |
| Seal Type | PTFE Lip Seal |
Compatibility
This piston pump is primarily designed for the ZF WG150 series transmission. It is also compatible with the WG180 and WG200 models when used in conjunction with the correct 0730365125: TYPE PLATE for identification. The pump interfaces directly with the 0631311009: GROOVED STUD for secure mounting. For optimal performance, verify your transmission’s serial number against the WG150 service manual. This part is not backward-compatible with older WG120 series units without hydraulic system modifications.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101109 | TRANSMISSION HOUSING | Encloses and supports gear train and hydraulic components |
| 4642301205 | TRANSMISSION HOUSING | Alternate housing variant for WG150 series |
| 0730365125 | TYPE PLATE | Identification tag for transmission model and specs |
| 0631311009 | GROOVED STUD | Mounting fastener for pump and housing alignment |
| 4642301168 | SCREEN SHEET | Fine mesh filter for hydraulic fluid intake |
| 4642301169 | SCREEN SHEET | Alternative filter mesh for debris protection |
| 0636100621 | HEXAGON SCREW | Fastener for securing pump to housing |
| 4642301186 | SCREEN SHEET | High-flow filter screen for heavy-duty applications |
| 4644106300 | SHIFT SYSTEM | Controls clutch engagement and gear selection |
| 4644306500 | COVER PLATE | Seals pump access port on transmission housing |
