Overview
This OEM genuine ZF 4108.017.104 P 7300 component is a critical hydraulic control element situated within the valve body assembly of heavy-duty construction machinery transmissions. It precisely modulates oil flow to clutch packs, enabling smooth gear engagement under extreme load conditions. The SKU 4108.017.104 is engineered to factory tolerances, ensuring direct interchangeability with the original factory-installed unit. When paired with a properly sealed 4108101120: HOUSING, this part maintains consistent hydraulic pressure across the entire operating temperature range.
Symptoms of Failure
- Delayed or harsh shifting under load: A worn 4108.017.104 causes erratic clutch engagement, particularly when moving heavy earthmoving equipment uphill.
- Transmission overheating with intermittent slipping: Internal leakage past the spool reduces line pressure, generating excessive heat and causing the P 7300 to lose torque capacity.
- Visible oil seepage around the valve body gasket: Degraded sealing surfaces allow ATF to escape, often accompanied by a burnt smell. Inspect the 0501325471: SEALING RING for simultaneous replacement.
- Erratic neutral-to-drive engagement: The transmission may hesitate or clunk violently when shifting from park to forward, indicating spool sticking within the bore.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4108.017.104 / P 7300 |
| Material | Hardened alloy steel with nitrided surface |
| Overall Length | 142 mm (5.59 in) |
| Bore Diameter | 18.5 mm (0.728 in) |
| Weight | 0.34 kg (0.75 lb) |
| Operating Pressure Range | 8–22 bar (116–319 psi) |
| OEM Reference | ZF 4108.017.104 |
| Related Housing | 4108201307: HOUSING |
| Oil Level Check | 0501215601: OIL LEVEL GAGE |
Compatibility
This OEM genuine spool is designed for ZF WG180, WG200, and WG310 series powershift transmissions commonly found in wheel loaders, dozers, and graders. It also fits select ZF 4WG-200 and 6WG-310 variants used in Volvo, Liebherr, and Caterpillar construction machinery. Always verify the part number against your transmission’s valve body casting. For complete assembly, ensure the 4108301450: INPUT SHAFT is free of scoring and the 0750116277: BALL BEARING shows no axial play.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4108101120 | HOUSING | Encloses valve body and directs oil flow |
| 4108201307 | HOUSING | Secondary cover for clutch control section |
| 0501215601 | OIL LEVEL GAGE | Dipstick for checking transmission fluid level |
| 0501325471 | SEALING RING | Prevents external oil leaks at valve body joint |
| 0730365280 | TYPE PLATE | Identification tag for transmission model |
| 4108301450 | INPUT SHAFT | Transfers engine torque to gear train |
| 0750116277 | BALL BEARING | Supports rotating shaft with minimal friction |
| 0630502039 | RETAINING RING | Secures bearing in housing bore |
| 0630531064 | RETAINING RING | Locks shaft in axial position |
| 0636302014 | SCREW PLUG | Seals hydraulic test ports |
Frequently Asked Questions
Q: Can I install the 4108.017.104 without replacing the sealing ring?
A: It is strongly recommended to always replace the 0501325471: SEALING RING simultaneously. Reusing a compressed seal often leads to immediate low-pressure leaks and erratic shifting.
Q: How do I confirm this part fits my ZF WG200 transmission?
A: Check the type plate on your transmission housing (part 0730365280: TYPE PLATE). The 4108.017.104 is compatible with serial numbers starting from 200-XXXXX. If your valve body uses a different spool diameter, consult your OEM parts manual.
Q: What causes premature wear on this spool?
A: Contaminated hydraulic fluid with particles larger than 10 microns is the primary cause. Always inspect the 0636302014: SCREW PLUG for metal debris during replacement.
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