708-1S-11212 Hydraulic Pump For Komatsu PC50MR-2 mini excavator

708-1S-11212 Hydraulic Pump For Komatsu PC50MR-2 mini excavator Featured Image
  • 708-1S-11212 Hydraulic Pump For Komatsu PC50MR-2 mini excavator

Short Description:

708-3S-00511 hydraulic main pump is aftermarket replacement spare part for Komatsu PC35MR-2 mini excavator. It acts as core hydraulic power source supplying pressurized hydraulic oil for boom, arm, bucket, travel and swing circuits.

Product Detail

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description

708-1S-11212 integrated twin variable piston hydraulic pump is the main hydraulic power unit for Komatsu PC50MR-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 load sensing control mechanism automatically adjusts displacement to match load requirement. During digging and loading work, pump increases flow to provide strong digging force; under idle or light-load travel condition, flow reduces to save fuel and lower system heat generation.
The pump uses high-precision piston and valve plate friction pair with special surface hardening treatment, improving wear resistance when hydraulic oil contains fine solid contaminants. Ductile cast iron housing undergoes stress relief annealing to eliminate internal stress, resisting vibration and thermal deformation under repeated impact loads.
High-performance FKM sealing kit maintains reliable sealing under fluctuating pressure and temperature. Every hydraulic pump passes strict bench test before shipment, including pressure test, flow detection and leakage inspection. It is fully interchangeable with original 708-1S-11212 pump, supporting direct bolt-on installation for PC50MR-2 overhaul and field repair.

product parameters

Part No：708-1S-11212
Product Type：Integrated Twin Variable Displacement Axial Piston Main Hydraulic Pump
Applicable Equipment：Komatsu PC50MR-2 / PC40MR-2 / PC35MR-2 / PC45R-8 Mini Excavator
Displacement：28 cc/rev
Nominal Working Pressure：22 MPa (220 bar)
Max Instantaneous Peak Pressure：25 MPa (250 bar)
Rated Rotation Speed：2200 rpm
Max Allowable Rotation Speed：2600 rpm
Working Medium：ISO VG46 Anti-wear Hydraulic Oil
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
Interchangeability：1:1 OEM interchangeable, direct bolt-on installation
Product Condition：Brand new aftermarket part, 100% hydraulic bench tested

advantage

- 28cc twin pump integrated design, well matched for PC50MR-2 multi-action excavation demand
28cc integrated twin variable pump delivers stable combined flow, meeting simultaneous boom, arm, bucket and travel compound operation, ensuring consistent digging force under mixed load.
- Advanced load sensing control for intelligent flow regulation
Built-in load sensing valve automatically adjusts pump output flow according to actual working load, reducing power waste and lowering hydraulic oil temperature during continuous multi-action operation.
- Reinforced anti-contamination piston & valve plate friction pair
High precision hardened piston and valve plate pair improves abrasion resistance, adapting to long-time continuous operation in dusty construction sites with slightly contaminated hydraulic oil.
- Compact combined pump assembly, multi-model compatible
Integrated pump body design fits PC50MR-2 narrow engine compartment, and supports multiple Komatsu small excavator models, reducing spare part inventory pressure.
- Original mounting flange and port layout for direct replacement
Flange and oil port positions fully match original machine, no modification required during replacement, shortening machine downtime for urgent site repair.
- Multi-model compatibility cyclic load bench reliability test
Each pump undergoes cyclic thermal load bench test simulating PC50MR-2 continuous compound digging and swing operation, verifying long-run stability and cross-model adaptability.

FAQ 

Q1: Which machine does 708-1S-11212 hydraulic pump fit?
A1: This hydraulic main pump fits Komatsu PC50MR-2, also compatible with PC40MR-2, PC35MR-2 and PC45R-8 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, widely used in municipal pipeline renovation, landscaping and narrow-site earthwork projects.

Q3: What are typical failure symptoms of worn main pump?
A3: Typical symptoms: fluctuating digging force under variable load, unbalanced speed during combined movements, pressure drop during heavy digging, irregular internal knocking noise, gradual oil temperature rise during long shifts, pump housing oil seepage.

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 digging force fluctuates after main pump replacement?
A5: The fault may not come from pump. Check relief valve setting, clogged filter, worn 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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