Hydraulic Pump and Motor Repair in the UAE
ASAT rebuilds hydraulic pumps and motors at our Sharjah workshop for machines across the UAE. We strip the unit, find out why it failed, replace or lap the worn parts, and test flow and pressure on our bench before it goes back. That last step is how you know the pump is fixed, not just reassembled.
Signs your hydraulic pump or motor needs repair
- A whine, rattle or marbles sound from the pump (often cavitation).
- Slow cylinders or weak breakout force at full throttle.
- Pressure that surges or will not build.
- Oil running hot, or bronze particles in an oil sample.
- A hydraulic motor that loses torque, creeps or turns unevenly.
Precision rotary group overhaul, lapping & volumetric efficiency restoration
Hydraulic pumps are the core power source of any fluid power system. ASAT provides disciplined teardown, diagnostic inspection, and rebuild services for axial piston pumps, gear pumps, and vane pumps suffering from pressure loss, fluid cavitation, or internal slippage. We carefully evaluate all wear surfaces, machine or replace worn rotary groups, and ensure proper operating tolerances.
- Axial piston, external/internal gear & balanced vane pump architectures
- Swashplate cradle bearing replacement and precision valve plate lapping
- Thorough fluid contamination analysis to advise root-cause prevention
Our pump overhaul process
- 1.Teardown & Contamination Inspection: Systematic disassembly to trace fluid degradation, metal particles, cavitation pitting, or overheating.
- 2.Component Tolerance Assessment: Detailed inspection of cylinder barrels, piston slipper shoes, swashplates, and shaft splines.
- 3.Lapping & Resurfacing: Precision flat lapping of valve plates and barrel faces to re-establish critical micro-gap oil films.
- 4.Sub-Assembly & Resealing: Installation of genuine-specification bearings, high-pressure shaft seals, and casing O-rings.
- 5.Dynamic Bench Verification: Verification of smooth mechanical rotation, pressure holding, and case drain flow under load.
Pumps we repair
- Variable-displacement axial piston pumps, including Rexroth units
- Fixed-displacement gear & tandem pump assemblies
- Excavator & crawler machinery main hydraulic pumps
- Industrial hydraulic power unit pump systems
- Hydrostatic transmission open and closed-loop pumps
What our bench test checks
On a recent 140 cc/rev axial piston pump we measured flow from 500 to 1,800 RPM at rising pressure steps up to 320 bar, with ISO VG 46 oil at 50°C, and confirmed case drain leakage within OEM limits. You get those readings with the pump.
Rebuild or replace?
Rebuilding makes sense when the housing and shaft are sound and the rotating group can be restored or sourced. Replacement makes sense when the housing is cracked or parts are no longer made. We tell you which after teardown, with photos.
Restoring drive torque, rotation smoothness & load-holding stability
When hydraulic motors lose operating torque, suffer internal oil bypassing, or exhibit jerky rotation, machinery operations stall. Our engineering team provides complete diagnostic teardown, component refurbishment, and performance restoration for radial piston, axial piston, and orbital hydraulic drive motors utilized in heavy winches, tracks, and industrial conveyors across the UAE.
Motor process
- 1.Diagnostic Disassembly: Teardown to inspect gear sets, cam rings, distributor valves, and mechanical braking units.
- 2.Shaft & Bearing Evaluation: Checking output shaft splines, keyways, and high-load tapered roller bearings for runout or play.
- 3.Rotary Group Reconditioning: Polishing cam lobes, valve plates, and internal distributor faces to restore smooth fluid paths.
- 4.High-Temperature Resealing: Fitting resilient shaft seals, backup rings, and body seals rated for continuous heavy duty.
- 5.Torque & Rotation Test: Verifying continuous rotation, brake release functionality, and internal bypass limits.
Hydraulic motors we repair
- Excavator & crawler final travel drive motors
- Slew and swing drive hydraulic motors
- High-torque low-speed (HTLS) radial piston motors
- Marine deck winch, capstan & crane drive motors
- Industrial mixer, shredder & conveyor drive units
Turnaround
Pump and motor overhaul: 1–2 days diagnosis, 3–5 days turnaround, flow and pressure verified on test bench.
Recent pump overhaul
A variable displacement pump came in whining, with surging pressure and slow boom cycles. Teardown showed cavitation pitting on the valve plate and worn slipper shoes. We lapped the plate, renewed the rotating group, shaft seals and bearings, then bench tested it back to baseline.
Hydraulic pump repair FAQs
How much does hydraulic pump repair cost in the UAE?
- It depends on pump type, size and how many parts need replacing. A reseal costs far less than a new rotating group. We quote after teardown, before work starts.
Do you repair Rexroth and excavator pumps?
- Yes. We overhaul Rexroth axial piston pumps and the main pumps on JCB, CAT, Komatsu and Volvo excavators.
How long does a pump rebuild take?
- Usually 3 to 5 days when parts are in stock; longer if a rotating group must be ordered.
Can you test my pump before I decide?
- Yes. A bench test shows flow and pressure against the rated figures, so you can decide on repair or replacement with real numbers.
What causes hydraulic pump cavitation?
- Usually a blocked suction strainer, a collapsed suction hose, oil that is too thick when cold, or low reservoir level.
Do you repair hydraulic motors too?
- Yes: travel, swing, radial piston, orbital and winch motors, tested for rotation, brake release and bypass.
Start with a quote
Send the machine details. We quote after inspection, before any work starts. Open 24 hours.