251500135 pilot propulsions rod for XCMG ZL50G/ZL50GL Wheel Loader

product parameters

Product Name: Boom Pilot Valve Handle
Part No.: 251500135
Applicable Model: XCMG ZL50G, ZL50GL Wheel Loader
Structure Type: Single-action pilot control handle
Valve Base Material: Cast aluminum base + engineering plastic housing
Control Function: Boom lifting and lowering
Medium: Construction machinery hydraulic oil
Working Temperature: -20℃ ~ +80℃
Inspection Items: Pressure calibration, neutral pressure holding test, sealing test, swing durability test
Installation Method: Bolt fixed on cab console
Matching Circuit: Pilot control oil circuit

Applicable Scenarios

It is installed on the loader cab console and dedicated to boom cylinder control. It cooperates with bucket pilot handle to complete shoveling, lifting, unloading and stacking. Widely used in continuous heavy-duty scenarios such as sand yards, mines, earthwork sites and cargo yards.

• Original mounting holes and port specifications, direct replacement without console or pipe modification
• Precision spool pair with low leakage, linear pressure output and smooth boom speed regulation
• High-quality built-in return spring, quick neutral reset for stable boom holding
• Impact and wear-resistant handle shell, not easy to crack after frequent operation
• Individual pressure calibration before delivery, consistent operation feel and good interchangeability
• Oil and aging resistant seals, reduce oil seepage at handle root
• Independent single boom control handle, replace separately instead of whole pilot assembly

FAQ 

Q：What causes stiff operation of boom pilot handle?
A：It is usually caused by blocked pilot filter, dirty oil jamming spool or fatigued spring. Clean circuit and replace filter first, replace handle if fault remains.

Q：What to do if the boom keeps dropping after releasing the handle?
A：It is mainly caused by stuck spool, failed seal or broken spring. Self-disassembly repair is not recommended due to high precision, replace the whole assembly.

Q：What causes oil leakage at the root of handle?
A：Mostly from aged internal seal ring, a few from base casting defect. It is difficult to replace seal separately, replace the whole handle assembly.

Q：Can boom handle and bucket pilot handle be interchanged?
A：Not interchangeable. They have different internal oil circuit and pressure logic, which will lead to disordered movement.

Q：How to extend the service life of pilot handle?
A：Replace pilot filter regularly and keep hydraulic oil clean. Avoid hitting or knocking the handle to prevent spool deformation.

Q：What if new handle responds slowly after installation?
A：Air inside pilot circuit must be purged after installation, then test again. If it is still slow after bleeding, check the supply pressure of pilot pump.