Overview
This OEM genuine ZF 4108.017.102 P 7300 is a critical pressure-regulating component designed for heavy-duty construction machinery transmissions. It functions as a hydraulic control valve that modulates oil flow within the transmission housing, ensuring precise clutch engagement and torque converter lock-up. The SKU 4108.017.102 sits directly within the valve body assembly, interfacing with the HOUSING to maintain consistent hydraulic pressure across all gear ranges. This genuine ZF part is engineered to withstand the extreme thermal and mechanical loads found in wheel loaders, excavators, and graders operating in demanding environments.
Symptoms of Failure
- Erratic gear engagement or delayed shifting — When the 4108.017.102 wears internally, hydraulic pressure fluctuates, causing harsh or sluggish shifts between forward and reverse gears.
- Transmission overheating under load — A failing pressure regulator can cause continuous clutch slippage, generating excessive heat that degrades transmission fluid and accelerates wear on adjacent components.
- Oil seepage around the valve body — Deterioration of the internal sealing surfaces leads to external fluid leaks, often visible as drips near the transmission pan or bell housing.
- Loss of power during uphill operation — Inconsistent pressure regulation reduces torque converter efficiency, making the machine feel underpowered when climbing or carrying heavy loads.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 4108.017.102 |
| OEM Reference | ZF P 7300 |
| Material | Hardened alloy steel with zinc-nickel coating |
| Overall Length | 112 mm (4.41 in) |
| Outer Diameter | 38 mm (1.50 in) |
| Weight | 0.42 kg (0.93 lbs) |
| Sealing Type | Integrated O-ring groove (uses O-RING 0634304358) |
| Operating Pressure Range | 8–22 bar (116–319 psi) |
| Temperature Range | -30°C to +120°C (-22°F to +248°F) |
Compatibility
This genuine ZF 4108.017.102 is primarily used in the WG180 and WG200 series powershift transmissions, which are common in construction machinery from brands like Liebherr, Volvo, and Caterpillar. It also fits select WG150 and WG250 variants where the valve body configuration matches the P 7300 pressure regulator design. Always verify the TYPE PLATE on your transmission housing to confirm model compatibility before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4108101175 | HOUSING | Encloses valve body and channels hydraulic fluid |
| 0636302015 | SCREW PLUG | Seals pressure test ports in the valve body |
| 0501325471 | SEALING RING | Prevents fluid bypass at plug interfaces |
| 0730365280 | TYPE PLATE | Identifies transmission model and serial number |
| 4108301437 | INPUT SHAFT | Transfers engine torque into the transmission |
| 0735330931 | BALL BEARING | Supports rotating shafts with minimal friction |
| 0630532160 | RETAINING RING | Secures bearing in axial position |
| 0630531130 | RETAINING RING | Locks gear assemblies on shaft |
| 4475280018 | SCREW PLUG | Closes drain or fill openings |
| 0634304358 | O-RING | Creates leak-proof seal between mating surfaces |
Frequently Asked Questions
Q: Can the 4108.017.102 be replaced without removing the entire transmission?
A: Yes, in most WG180 and WG200 transmissions, this pressure regulator is accessible after draining the fluid and removing the valve body cover. However, you must also replace the SEALING RING and O-RING during reassembly to prevent future leaks.
Q: What causes premature failure of this pressure regulator?
A: Contaminated transmission fluid containing metal particles or clutch debris is the primary cause. The abrasive particles score the valve spool and bore, leading to internal leakage. Always inspect the HOUSING for scoring when replacing this part.
Q: How do I verify this part fits my ZF transmission?
A: Locate the TYPE PLATE on the transmission housing. It will display the model number (e.g., WG200) and serial number. Cross-reference these with the P 7300 designation stamped on the 4108.017.102 body to confirm compatibility.
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