708-3S-00511 Hydraulic Pump For Komatsu PC35MR-2 excavator

708-3S-00511 Hydraulic Pump For Komatsu PC35MR-2 excavator Featured Image
  • 708-3S-00511 Hydraulic Pump For Komatsu PC35MR-2 excavator

Short Description:

708-1S-00222 hydraulic main pump is aftermarket replacement spare part for Komatsu PC30MR-1 and PC30UU mini excavator. It serves as the core hydraulic power source to supply pressurized hydraulic oil for boom, arm, bucket, travel and swing circuits.

Product Detail

Product Tags

description

708-3S-00511 twin variable piston hydraulic pump is the main hydraulic power unit for Komatsu PC35MR-2 mini excavator, driven directly by engine. It converts mechanical power into hydraulic energy and delivers variable flow to all hydraulic actuators. The swash plate variable control mechanism automatically adjusts displacement to match load requirement. During digging and loading work, pump increases flow to provide powerful digging force; under idle or light-load travel condition, flow reduces to save fuel and reduce system heat generation.
The pump adopts high-precision piston and valve plate pair with special surface hardening treatment, improving wear resistance when hydraulic oil contains fine contaminants. Ductile cast iron housing undergoes stress relief annealing to eliminate internal stress, resisting vibration and thermal deformation under repeated short-cycle impact loads.High-performance FKM sealing kit provides reliable sealing performance under fluctuating pressure and temperature. Every hydraulic pump passes strict bench test before shipment, including pressure test, flow detection and leakage inspection.

product parameters

Part No：708-3S-00511
Product Type：Twin Variable Displacement Axial Piston Main Hydraulic Pump
Applicable Equipment：Komatsu PC35MR-2 Mini Excavator
Control Mode：Swash plate variable control with load sensing
Displacement：24 cc/rev
Nominal Working Pressure：21 MPa (210 bar)
Max Instantaneous Peak Pressure：24 MPa (240 bar)
Rated Rotation Speed：2200 rpm
Max Allowable Rotation Speed：2600 rpm
Working Temperature Range：-20℃ ~ +105℃
Main Material：Ductile cast iron housing, hardened piston & valve plate, FKM fluorine rubber seal
Surface Treatment：Precision grinding, surface hardening, stress relief annealing, anti-rust coating
Shaft Specification：Original standard splined shaft
Interchangeability：1:1 OEM interchangeable, direct bolt-on installation
Product Condition：Brand new aftermarket part, 100% hydraulic bench tested

advantage

- 24cc twin pump integrated design, perfectly matched for PC35MR-2 compound action requirement
Integrated twin 24cc variable displacement structure delivers independent flow output for multi-way circuits, meeting the demand of simultaneous boom, arm and travel combined operation without power shortage.
- Optimized load sensing control for energy saving and heat reduction
Advanced load sensing control automatically adjusts pump output according to actual load, cutting unnecessary power loss and lowering hydraulic oil temperature during continuous multi-action operation.
- Reinforced hardened piston & valve plate friction pair with anti-contamination performance
High precision hardened piston and valve plate pair improves anti-wear and anti-pollution capability, suitable for long hours of frequent cyclic digging in dusty construction sites.
- Integrated compact pump assembly, saving limited engine compartment space
Combined main pump assembly integrates variable pump and control valve block, compact structure to fit the narrow installation space of PC35MR-2 mini excavator, convenient for disassembly and maintenance.
- Original mounting flange and port layout for direct replacement
The flange and oil port positions fully match original machine, no modification required during replacement, shortening machine downtime for urgent repair on narrow job sites.
- Mini excavator multi-action cyclic load bench reliability test
Each pump undergoes cyclic thermal load bench test simulating PC35MR-2 continuous compound digging and swing operation, verifying long-term stable performance.

FAQ 

Q1: Which machine does 708-3S-00511 hydraulic pump fit?
A1: This hydraulic main pump fits Komatsu PC35MR-2 mini excavator. Confirm machine serial number before purchase.

Q2: What hydraulic function does this main pump support?
A2: It provides pressurized variable hydraulic oil for boom, arm, bucket, travel and swing hydraulic circuits, to realize all digging and moving actions of mini excavator, widely used in municipal renovation, landscaping and indoor demolition projects.

Q3: What are typical failure symptoms of worn main pump?
A3: Typical symptoms: weak digging force under combined load, inconsistent speed of multi-action operation, pressure drop during heavy digging, abnormal internal knocking noise, continuous oil temperature rise, pump housing oil leakage.

Q4: What inspections should be done before installing new hydraulic pump?
A4: Inspect hydraulic oil quality and filter condition, check relief valve and control valve block. Fully flush hydraulic tank and pipelines to remove metal debris. Replace degraded hydraulic oil before assembly.

Q5: Why excavator multi-actions remain uncoordinated after main pump replacement?
A5: The fault may not come from pump. Check relief valve setting, clogged filter, damaged control valve, air trapped inside hydraulic circuit. Air bleeding must be completed after installation.

warehouse

We have built four spare parts warehouses in Xuzhou, Jining, Kunshan and Changsha to provide customers from all over the world with a variety of high-quality spare parts. We can basically ship self-provided spare parts within three days after confirming the order. If the spare parts need to be adjusted or processed, they will be shipped within 7-30 days.

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our warehouse

Pack and ship

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