Inspection Instructions - Danfoss 20 Series Service Manual

Service Manual and
Repair Instructions
Troubleshooting

Inspection Instructions

14
Axial Piston Pumps Series 20
Checking the charge pressure
Checking the charge pump
Hex-plug, Spring
Shims Valve cone
Checking the charge check valves
1. Remove charge pump to examine check
valves (see page 21).
L1003506 • Rev BA • Jun 2014
1. Clean the charge pressure gauge connection
on the pump.
2. Pressure gauge (see recommended measuring
instruments) to be connected.
3. Set operating speed at 1500 min
4. Charge pressure with the pump in neutral ca.
15 - 18 bar [218 - 261 psi]. When the pump in
forward or reverse the charge pressure should
be at a two bar lower level (purge relief valve,
motor).
F000 077
3
1. Inspect if contamination is holding the valve
open and for galling or wear on valve cone
and seat and inspect for broken spring.
2. The shaft and gear teeth must work freely.
3. Further disassembly of the charge pump is not
permitted.
F000 078
5+6 10
F000 079
2. Check the spring pressure and for correct
operations. Check if conta mination may be
prohibiting free movement of the ball.
-1
5+6
F000 080