We repair Kawasaki K3V, K3VL and K5V axial piston pumps, their regulators and the swing and travel motors that work with them, mainly from excavators, crawler cranes and drilling rigs, and from marine and industrial power packs. We are an independent repairer, not a Kawasaki authorised service partner, and we will tell you plainly when repair makes sense and when an exchange unit is the better buy.
Where Kawasaki pumps are used
The K3V and K5V families are swashplate axial piston pumps, most often supplied as tandem units: two pumps in one housing driven by one shaft, usually with a small gear pump for pilot oil. Many excavator makers fit them as the main pump, which is why so many of the pumps from UAE construction sites and quarries that reach our bench are Kawasaki.
- K3V tandem pumps (for example K3V63DT, K3V112DT, K3V140DT, K3V180DT): excavators from about 13 to 50 tonnes, crawler cranes, piling and drilling rigs.
- K5V tandem pumps (for example K5V140DT, K5V160DT, K5V200DTH): newer excavators, with higher pressure and efficiency.
- K3VL single pumps: open circuit industrial and mobile use, including power packs.
- Swing and travel motors on the same machines, often Kawasaki M2X or M5X swing motors with their reduction gearboxes.
How a K3V or K5V works
Each pump section has a cylinder block with pistons and shoes that slide on a swashplate. The regulator on each section sets the swashplate angle in response to the machine’s control signals: total power control (so the two pumps together do not stall the engine), flow control from the main valve (negative or positive flow control, depending on machine), and sometimes an electronic power shift signal. A tandem pump problem therefore often looks like a machine control problem.
Typical failure modes
- Worn shoes and swashplate, from contaminated or overheated oil. The pump loses efficiency and gets noisy.
- Cylinder block and valve plate scoring, giving internal leakage, heat and slow functions under load.
- One side weak. If one pump section is worn or its regulator is sticking, the functions on that side (for example one track, or boom and bucket) are slow while the other side is normal.
- Regulator faults. Worn spools and sleeves, broken springs or blocked orifices in the regulator cause hunting, engine stalling or loss of power.
- Gear pump failure. The small pilot pump wears and pilot pressure falls, so every function becomes sluggish.
- Bearing and spline wear at the drive coupling or between the two sections.
- Shaft seal leaks, often from high case pressure.
UAE quarries and sites add fine dust and long hot shifts to the list. If you fit a rebuilt pump to a contaminated system, the new parts wear quickly. See ISO 4406 oil cleanliness and hydraulic overheating in UAE heat.
Checks before removing the pump
Pump removal on an excavator is a big job, so we test first:
- Main relief and pilot pressures against the machine’s specification.
- Comparing the two pump sections on the same function.
- Case drain flow where the machine allows it.
- Regulator settings and power shift signal.
- The suction strainer, return filters and oil condition.
Often a “pump problem” turns out to be a pilot pressure, a relief valve or a control signal fault. We report what the tests show before you commit to removing the pump. See noisy hydraulic pump.
What to read off the nameplate
Send a photograph of the Kawasaki plate on the pump housing. It shows:
- Model code, for example K3V112DTP followed by further characters that identify the regulator and options.
- Serial number.
- Often a machine maker’s part number on a separate label, which tells us which regulator settings and options that machine uses.
Also tell us the machine make, model and serial number. Two pumps with the same Kawasaki model can carry different regulators and settings for different machines.
How we repair Kawasaki pumps
- Strip and inspect both pump sections, regulators and the gear pump, and measure the wear parts.
- Report and quote with photographs and the options: full rotating group kit, partial repair, or exchange.
- Rebuild with genuine or equivalent parts, stated in the quote, including new seals and bearings.
- Set and test the regulators and test the unit before return.
Repair or exchange
Repair is usually the better value when the housings, shaft and swashplates are sound. Exchange is worth considering if the housing is damaged, the rear cover is cracked, or the rotating groups in both sections are worn out and the machine is old. We quote each option we can source so you can weigh cost against machine life.
