Danfoss H1 Service Manual

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Contents

Pump adjustmentThis section offers instruction on inspection and adjustment of pump components. Read through theentire topic before beginning a service activity. Refer to Pressure measurements on page 26, for location ofgauge ports and suggested gauge size.Standard proceduresW WarningContamination can damage internal components and void your warranty. Take precautions to ensuresystem cleanliness when removing and reinstalling system lines1. 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 andplug 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 metalparticles.6. If there are signs of contamination in the hydraulic fluid, replace all filters and drain the hydraulicsystem. 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 adjustmentThis 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 pressurerelief 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 (zerodisplacement) when measuring charge pressure.2. The table below shows the acceptable pump charge pressure range for some nominal charge reliefvalve settings (refer to model code located on serial number plate). These pressures assume 1800Service ManualH1 45/53/60/68 Tandem Closed Circuit Axial Piston PumpsAdjustments32 | © Danfoss | June 2018 520L0928 | AX00000103en-US0303