Overview
The ZF 0501.311.879 is a critical OEM genuine component designed specifically for the WG 160 Series transmission. This precision-engineered part functions as a sealing and alignment element within the hydraulic control circuit, ensuring consistent oil pressure regulation and smooth gear engagement. Positioned between the main valve body and the clutch housing, the SKU 0501.311.879 acts as a flow director, preventing cross-contamination of hydraulic circuits. When installed alongside the 4656201075: HOUS.FRONT SECT and the 4656201035: HOUSING REAR PART, this part forms a sealed chamber that maintains the integrity of the transmission’s lubrication system.
Symptoms of Failure
- Hydraulic oil seepage at the bell housing: A worn 0501.311.879 often causes visible oil drips near the transmission-to-engine interface, particularly after extended highway driving.
- Erratic shift timing under load: When this part degrades, you may experience delayed or harsh upshifts when towing heavy loads, as internal pressure bleeds past the seal.
- Low transmission fluid warning without visible external leaks: Internal bypassing of fluid through a failing 0501.311.879 can trigger low-level alarms even when the sump appears full.
- Whining noise during gear changes: A compromised seal allows air ingestion into the hydraulic circuit, producing a high-pitched whine during 2-3 shift sequences.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 0501.311.879 |
| Material | Hardened steel with nitrile rubber sealing lip |
| Outer Diameter | 68.5 mm |
| Inner Diameter | 42.0 mm |
| Height | 14.2 mm |
| Weight | 0.18 kg |
| Operating Temperature Range | -40°C to +120°C |
| OEM Reference | ZF 0501.311.879 (Genuine) |
Compatibility
This part is primarily engineered for the ZF WG 160 Series, but it also cross-fits with the WG 180 and WG 200 transmissions due to shared hydraulic architecture. It is directly compatible with the 4472239178: HOUSING REAR PART and requires the 0631306816: CYLINDRICAL PIN for precise alignment during installation. The 0501.311.879 is not recommended for use in WG 120 or WG 150 models without verifying housing bore dimensions.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656201075 | HOUS.FRONT SECT | Front section housing for clutch pack assembly |
| 4656201035 | HOUSING REAR PART | Rear housing for output shaft support |
| 4472239178 | HOUSING REAR PART | Alternate rear housing variant for WG160 |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for housing-to-case mating |
| 0636100817 | CAP SCREW | M10x25 bolt for securing valve body |
| 4656301016 | SCREEN SHEET | Fine mesh filter for hydraulic fluid intake |
| 4656301017 | SCREEN SHEET | Coarse mesh pre-filter for sump pickup |
| 0636100803 | CAP SCREW | M8x20 bolt for oil pan attachment |
| 0501316470 | BREATHER | Pressure equalization vent for transmission case |
| 0750301003 | OIL FEED.HOUSG. | Oil delivery tube to clutch drum |
Frequently Asked Questions
Q: Can the 0501.311.879 be reused after a transmission rebuild?
A: No. This is a single-use sealing component. Reusing it will almost certainly lead to internal leakage and premature failure of the WG160 hydraulic system. Always replace with a new OEM genuine part.
Q: What torque specification applies to the housing bolts when installing this part?
A: The 0636100817: CAP SCREW fasteners should be torqued to 45 Nm (33 ft-lbs) in a cross-sequence pattern. Over-torquing can distort the sealing surface of the 0501.311.879.
Q: Does this part require any special lubrication before installation?
A: Yes. Lightly coat the outer sealing lip with clean ATF (Dexron III or ZF LifeguardFluid 8) to prevent dry start-up damage. Do not use grease or petroleum-based lubricants.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
Request a Quote →
