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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
on page 26, for location of
gauge ports and suggested gauge size.
Standard procedures
W
Warning
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 reinstalling the pump, test for leaks.
Charge pressure relief valve adjustment
This procedure explains how to check and adjust the charge pressure relief valve.
See
Fastener size and torque chart
on page 66 for torques and wrench sizes on other charge pressure
relief valves.
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, or L3. Operate the system with the pump in neutral (zero
displacement) when measuring charge pressure.
2. The table below shows the acceptable pump charge pressure range for some nominal charge relief
valve settings (refer to model code located on serial number plate). These pressures assume 1800
Service Manual
H1 45/53/60/68 Tandem Closed Circuit Axial Piston Pumps
Adjustments
32 |
©
Danfoss | June 2018
520L0928 | AX00000103en-US0303