Pump adjustment
This section offers instruction on inspection and adjustment of pump components. Read through the
entire topic before beginning a service activity. Refer to Pressure measurements, for location of gauge
ports and suggested gauge size.
Standard Procedures
Caution
Contamination can damage internal components and void your warranty. Take precautions to ensure
system cleanliness when removing and reinstalling system lines
1. With the prime mover off, thoroughly clean the outside of the pump.
2. If removing the pump, tag each hydraulic line. When you disconnect hydraulic lines, cap them and
plug each open port to prevent contamination.
3. Ensure the surrounding area is clean and free of contaminants like dirt and grime.
4. Inspect the system for contamination.
5. Check the hydraulic fluid for signs of contamination: oil discoloration, foam in the oil, sludge, or metal
particles.
6. If there are signs of contamination in the hydraulic fluid, replace all filters and drain the hydraulic
system. Flush the lines and refill the reservoir with the correct filtered hydraulic fluid.
7. Before re-installing the pump, test for leaks.
Charge Pressure Relief Valve
This procedure explains how to check and adjust the charge pressure relief valve. Refer to model code
located on serial number plate for charge relief setting.
1. Install a 50 bar [1000 psi] pressure gauge in charge pressure gauge port M3. Install a 10 bar [100 psi]
gauge at case pressure port L1, L2. Operate the system with the pump in neutral (zero displacement)
when measuring charge pressure.
Listed pressures assume a pump speed of 1800 min-1 (rpm) and charge flow of 26.5 l/min [7 US gal/
min]. At higher pump speeds or higher charge flows the charge pressure will rise over the rated
setting.
Service Manual
MP1
Adjustments
46 |
©
Danfoss | April 2019 AX00000244en-000201
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