2-8
1 Check oil level in reservoir:
a .fill to proper level as marked on site tube.
2 Inspect external control linkage for:
a. misadjustment or disconnection
b. binding, bending or breakage
c. misadjusted, damaged or broken hydroback
3 Inspect servo control valve for: (if used)
a. proper inlet pressure
b. misadjusted or damaged neutral return spring
c. galled or stuck control spool
d. galled or stuck servo piston
4 Inspect heat exchanger for:
a. obstructed air flow
b. improper plumbing (inlet to outlet)
c. obstructed fluid flow
5 Inspect inlet filter or screen for:
a. plugged or clogged screen or filter
b. obstructed inlet or outlet
c. open inlet to charge pump (open line)
6 Check charge pressure:
a. follow test procedures section 2.5
7 Inspect charge relief valve for:
a. poppet held of seat
b. damaged or broken spring
c. damaged valve seat
d. improper charge relief setting
8 Inspect charge pump for:
a. broken or missing drive coupling
b. damaged or missing o-rings
c. galled or broken geroter set
9 Inspect system relief valves for:
a. damaged or broken springs
b. valve held of seat
c. damaged valve seat
d. improper pressure relief settings
10 Check system pressure:
a. follow test procedures section 2.5
11 Inspect hydraulic motor for:
a. disconnected coupling
TROUBLE SHOOTING 2.4
System Diagnosing Steps And Special Tools
C1699
C1704
C1698
Pressure gauges
Vacuum gauge
30in. Hg
Adapter fittings
C1697
Caps and plugs
0 - 500PSI (34.5Bar) 0 - 5000PSI (345Bar)
Photographs in the right hand column show some of the
special tools that may be required to diagnose and repair
the hydrostatic system.
A complete testing kit is available from Thomas, p/n
44365, that contains gauges, hoses and adapters for
Sauer Sundstrand model pumps.
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