SH120 Auxiliary Relief Valve Compatible with Excavator

1. Product Overview & Wholesale Price Range

The SH120 Auxiliary Relief Valve is vital pressure‑protection spare part for excavator auxiliary hydraulic circuit. It stabilizes auxiliary circuit working pressure and prevents over‑pressure damage to hydraulic cylinder and matching hydraulic assemblies. Common replacement symptoms include weak digging force, hydraulic jitter, slow implement movement and auxiliary pressure drifting.

• Factory Wholesale Price: $138 – $225 USD Direct factory price for hydraulic repair workshops
• Material Specifications: High‑strength alloy steel valve body, precision spool and spring assembly, stable pressure‑limiting performance, excellent wear‑resistance and sealing performance, long‑term service life
• MOQ & Bulk Discount: 1 Unit, favorable price for large‑volume maintenance orders
• Lead Time: 1‑3 working days, sufficient stock supports worldwide logistics delivery
• Warranty: 12‑month replacement warranty, full hydraulic pressure testing completed before shipment

2. Application Scope

Perfectly fits SH120 excavator auxiliary hydraulic system and construction machinery overhaul projects:

• Hydraulic Overhaul: Direct replacement for worn, stuck or damaged original auxiliary relief valve assembly.
• Hydraulic Fault Repair: Resolve weak digging torque, hydraulic jitter and auxiliary pressure drifting failures.
• Repair Workshop: Accurate dimension matching, simple installation, reliable pressure‑limiting performance.
• Overseas Parts Dealer: Stable inventory supply, complete QC records support cross‑border spare‑parts trading.

3. Common Auxiliary Relief Valve Failure Troubleshooting

• Fault 1: Excavator Digging Force Insufficient & Slow Implement Movement
  Cause: Internal spool wear, spring fatigue, dirt trapped inside valve clearance.
  Solution: Install brand‑new SH120 Auxiliary Relief Valve, flush hydraulic circuit and replace hydraulic filter.
• Fault 2: Hydraulic Jitter & Unstable Auxiliary Pressure
  Cause: Valve core abrasion, internal spring performance degradation.
  Solution: Fit SH120 Auxiliary Relief Valve, thoroughly clean the whole hydraulic oil circuit.
• Fault 3: Hydraulic System Overheat & Abnormal Working Noise
  Cause: Internal component wear, oil passages blocked by hydraulic contamination.
  Solution: Replace complete auxiliary relief valve assembly, check hydraulic oil cleanliness.
• Fault 4: Oil Leakage At Auxiliary Relief Valve Mounting Position
  Cause: Seal ring aging, mating surface scratch damage.
  Solution: Replace full auxiliary relief valve assembly or matching seal repair kit.

4. Matching Hydraulic Spare Parts Recommendation

5. Frequently Asked Questions

Q1: How do I confirm this auxiliary relief valve fits my excavator?
A: Please confirm excavator model and installation dimension for fast compatibility verification.

Q2: What quality inspection will be carried out before goods dispatch?
A: Every SH120 Auxiliary Relief Valve goes through strict hydraulic test to guarantee stable pressure‑limiting performance.

Q3: What points need attention while installing auxiliary relief valve?
A: Keep mounting surface and oil ports clean to prevent dirt entering valve interior, test digging force and system pressure after installation.