Overview
The ZF 4699.825.107 GP25 is a genuine OEM gear pump assembly engineered specifically for heavy-duty ZF powershift transmissions used in construction machinery. This critical hydraulic component generates the necessary oil flow and pressure to actuate clutch packs, lubricate internal gears, and maintain thermal stability within the transmission system. Positioned directly on the transmission housing, the GP25 pump draws fluid from the sump and delivers it through precision-machined passages. The SKU 4699.825.107 designates a factory-sealed unit that meets ZF’s exacting tolerances for volumetric efficiency and durability under high-load cycles. Replacing a worn or failing pump with this genuine part restores proper hydraulic function and prevents cascading damage to valve bodies and clutches.
Symptoms of Failure
When the ZF 4699.825.107 GP25 begins to degrade, operators will notice distinct performance issues. Recognizing these signs early can prevent costly transmission overhauls.
- Intermittent gear slipping under load: A worn pump cannot maintain adequate clutch pressure, causing the transmission to slip when the machine is under heavy strain, such as during grading or lifting operations.
- Audible whining or cavitation noise from the transmission: As internal clearances increase, the pump struggles to prime, producing a high-pitched whine that indicates air entrainment or insufficient fluid supply.
- Delayed engagement when shifting from neutral to drive or reverse: Reduced hydraulic flow results in sluggish clutch fill times, making the machine hesitate before moving.
- Visible oil leaks around the pump mounting flange or shaft seal: Worn O-rings or a cracked housing allow transmission fluid to escape, leading to low sump levels and eventual overheating.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 4699.825.107 (GP25) |
| Pump Type | Gear pump, fixed displacement |
| Displacement (estimated) | 25 cc/rev |
| Maximum Operating Pressure | 25 bar (362 psi) |
| Housing Material | High-strength aluminum alloy |
| Gear Material | Case-hardened steel |
| Overall Length | 185 mm |
| Mounting Flange Diameter | 100 mm (SAE A 2-bolt) |
| Weight | 4.2 kg (9.3 lbs) |
| Seal Type | Viton dual-lip shaft seal |
Compatibility
This genuine ZF 4699.825.107 GP25 pump is engineered for use in the following ZF transmission models commonly found in wheel loaders, telehandlers, and graders:
- ZF WG180 series (WG180, WG181, WG182)
- ZF WG200 series (WG200, WG201, WG202)
- ZF 4WG-200 and 4WG-210 variants
- ZF 6WG-250 heavy-duty transmissions
Always verify your transmission’s serial number and pump mounting pattern before installation. The GP25 designation indicates a specific displacement and port orientation that may differ from earlier GP20 or GP30 pumps. For cross-reference, this part replaces ZF numbers 4699.825.106 and 4699.825.108 in certain production runs.
