Inspection Instructions; Checking The Charge Pressure; Checking The Charge Pump; Checking The Charge Check Valves - Sauer Danfoss 20 Series Service Manual

INSPECTION
INSTRUCTIONS
14
Series 20 – Axial Piston Pumps
Service Manual and Repair Instructions
Trouble Shooting

Checking the charge pressure

Checking the charge pump

Hex-plug, Spring
Shims Valve cone

Checking the charge check valves

5+6
1. Remove charge pump to examine
check valves (see page 21).
DKMH.PS.315.B1.02 520L0535
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
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