Overview
The ZF 0501.218.958 SUCTION FILTER is a critical hydraulic component engineered specifically for the WG100, WG130, and WG131 transmission series. This OEM genuine part sits directly within the transmission oil sump, where it continuously filters the hydraulic fluid before it enters the pump circuit. By trapping particulate contaminants and wear debris, the 0501.218.958 ensures that only clean oil circulates through the valve body, torque converter, and clutch packs. This filter is often replaced during major overhauls alongside the 2094101018: TRANSMISSION HOUSING to guarantee a completely sealed and debris-free internal environment. The SKU 0501.218.958 is a direct OEM replacement, meaning no modifications are required for installation.
Symptoms of Failure
When the ZF 0501.218.958 suction filter becomes clogged or degrades, operators will notice specific performance issues. The most common symptom is delayed gear engagement during cold starts, as restricted oil flow prevents the clutches from filling quickly. Another clear sign is intermittent gear slipping under load, particularly when climbing grades or towing heavy equipment. You may also observe erratic shift quality—harsh or soft shifts that vary unpredictably. Finally, a severely blocked filter can cause overheating of the transmission fluid, indicated by a rising temperature gauge or burnt oil smell. These symptoms often occur when the filter is not replaced during routine service intervals.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 0501.218.958 |
| Type | Suction Filter (In-Tank) |
| Filtration Media | Synthetic Fiber with Wire Mesh |
| Overall Length | 185 mm |
| Outer Diameter | 95 mm |
| Connection Thread | M22 x 1.5 |
| Operating Pressure | Up to 2 bar (suction side) |
| Temperature Range | -20°C to +120°C |
| Weight | 0.42 kg |
| OEM Reference | ZF 0501.218.958 |
Compatibility
This suction filter is precision-machined for the ZF WG series powershift transmissions. It is directly compatible with the following models: WG100, WG130, and WG131. These transmissions are commonly found in industrial forklifts, reach stackers, and heavy-duty material handling equipment. The filter also fits certain variants of the WG180 and WG200 series when used with the correct 2094301069: HOUSING adapter. For proper sealing, always install a new 0634303085: O-RING during replacement. If you are rebuilding the entire assembly, consider replacing the 2094298054: HOUSING and the 2094301071: COVER to ensure a complete seal against contamination.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2094101018 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 2094301069 | HOUSING | Adapter housing for filter mounting |
| 2094298054 | HOUSING | Secondary housing for valve body |
| 2094301071 | COVER | Sealing cover for filter access port |
| 2094301030 | GASKET | Paper gasket for housing joint |
| 0750111371 | SHAFT SEAL | Prevents oil leakage at output shaft |
| 0634303085 | O-RING | Elastomeric seal for filter neck |
| 0631306670 | CYLINDRICAL PIN | Alignment pin for housing assembly |
| 0636011356 | HEXAGON SCREW | Fastener for housing attachment |
| 4475280066 | SCREW PLUG | Sealing plug for drain port |
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