Overview
This ZF 5838.300.652 PRESSURE LINE is a critical OEM genuine hydraulic conduit engineered for the demanding lubrication and cooling circuits within heavy-duty construction machinery transmissions. Positioned internally to route pressurized oil to the clutch packs and planetary gear sets, this rigid line ensures consistent fluid delivery under extreme torque loads. The part number 5838.300.652 is precision-formed to match factory specifications, guaranteeing a leak-free seal against mating surfaces. When paired with a DIFFERENTIAL HOUSING, this pressure line maintains the structural integrity of the entire hydraulic network.
Symptoms of Failure
- Hydraulic oil seepage at transmission casing: A cracked or fatigued pressure line allows pressurized fluid to escape, leaving visible puddles beneath the vehicle after shutdown.
- Delayed gear engagement under load: Insufficient line pressure starves the clutch packs, causing a noticeable lag when shifting from neutral to drive in excavators or wheel loaders.
- Overheating transmission fluid: A compromised line disrupts oil flow to the cooler, leading to elevated sump temperatures and potential thermal degradation of seals.
- Whining or cavitation noise from pump: Air ingestion through a damaged pressure line creates a high-pitched sound, indicating aeration of the hydraulic circuit.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 5838.300.652 |
| Material | Seamless cold-drawn steel tube |
| Length (approx.) | 320 mm |
| Outer Diameter | 12 mm |
| Wall Thickness | 1.5 mm |
| Weight | 0.18 kg |
| OEM Reference | ZF 5838.300.652 |
| Surface Finish | Phosphate-coated |
Compatibility
This pressure line is primarily designed for ZF WG180 and WG200 series powershift transmissions commonly found in construction loaders, graders, and compactors. It also fits select ZF 4WG-200 and 6WG-200 variants used in articulated dump trucks. For optimal performance, always replace this line alongside the DIFFERENTIAL unit and the TAPER ROLLER BEARING which supports the output shaft. Verify your transmission serial number against ZF parts catalogs before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 5838109009 | DIFFERENTIAL | Distributes torque between drive wheels |
| 0750117075 | TAPER ROLLER BEARING | Supports axial and radial shaft loads |
| 2093209023 | DIFFERENTIAL | Alternate differential assembly for WG series |
| 5838300626 | DIFFERENTIAL HOUSING | Encloses differential gears and bearings |
| 0631329088 | SPRING PIN | Secures shift fork to actuation rod |
| 5838300811 | THRUST WASHER | Controls axial clearance in planetary sets |
| 5838300721 | AXLE BEVEL GEAR | Transfers power from differential to axle shafts |
| 5838300633 | AXLE | Drives final wheel reduction gears |
| 5838300753 | THRUST WASHER | Prevents gear face wear under heavy loads |
| 5838300818 | THRUST WASHER | Spacer for differential side gears |
Frequently Asked Questions
Q: Can I reuse the old sealing washers when installing the 5838.300.652 pressure line?
A: No. ZF recommends replacing all copper or aluminum sealing washers at the banjo fittings. Reusing old seals risks fluid bypass and pressure loss, which can damage the DIFFERENTIAL unit.
Q: How do I confirm this pressure line fits my ZF 4WG-200 transmission?
A: Check the casting number on your transmission housing near the oil filter. If it reads “4WG-200” followed by a serial number above 50000, this line is compatible. Always cross-reference with the DIFFERENTIAL HOUSING part number to ensure bolt-hole alignment.
Q: What torque should I apply to the pressure line fittings?
A: Tighten the banjo bolts to 35 Nm (26 ft-lb). Over-torquing can distort the line and cause internal stress fractures. Use a thread locker on the SPRING PIN that retains the line bracket.
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Phone: +86 158 2286 3467 |
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