Eaton 72400 Repair Information page 21

Model 72400
Fault - Logic
Trouble Shooting
Diagram Action Step Comments
1 Inspect External Control Linkage for:
a. misadjusted or disconnected
b. binding, bent, or broken
2 Inspect Control Valve for:
a. plugged control orifice(s)
b. damaged mounting gasket
c. misadjusted, damaged or broken neutral return spring
d. broken control connector pin
e. faulty destroke valve (if used)
f. galled or stuck control spool
g. neutral detent or lockout switch misadjusted (if used)
3 Inspect System Relief Valves * for:
a. improper pressure relief setting
b. damaged or broken spring
c. valve held off seat
d. damaged valve seat
4 Inspect Servo Piston for:
a. misadjusted, damaged or broken neutral return spring
assembly
b. galled or stuck servo piston
c. damaged or missing o-ring and/or back-up ring
5 Check Oil Level in Reservoir:
a. consult owner/operators manual for the proper type fluid
and level
6 Inspect Heat Exchanger for:
a. obstructed air flow (air cooled)
b. obstructed water flow (water cooled)
c. improper plumbing (inlet to outlet)
d. obstructed fluid flow
7 Inspect Heat Exchanger Bypass Valve for:
a. improper pressure adjustment
b. stuck or broken valve
8 Inspect Bypass Valve for: (if used)
a. held in a partial or full open position
9 Inspect Inlet Screen or Filter for:
a. plugged or clogged screen or filter element
b. obstructed inlet or outlet
c. open inlet to charge pump
10 Check System Pressure:
a. See figure 3-1 for location of pressure gauge installation
b. consult owner/operators manual for maximum system
relief valve settings
11 Check Charge Pressure:
a. See figure 3-1 for location of charge pressure gauge
installation
b. consult owner/operators manual for maximum charge
relief valve settings
12 Inspect Charge Relief Valve for:
a. improper charge relief pressure setting *
b. damaged or broken spring
c. poppet valve held off seat
13 Inspect Motor for:
a. consult owner/operator manual for motor operation and
trouble shooting
14 Inspect Charge Pump for:
a. broken or missing drive key
b. damaged or missing o-ring
c. excessive gerotor clearance
d. galled or broken gerotor set
* System/Charge Relief Valve
Pressure Settings
Inlet Vacuum
Case Pressure
Charge Pressure
System Pressure
The high pressure relief valves are all factory preset and cannot
be readjusted.
The pressure setting is stamped on each valve with a three digit
number. To identify, multiply the noted number by 10 to get the
valves pressure setting.
Example: 10 x 500 = [5000 PSI] 345 bar
21
0,203 bar [6 inHg] max.
1,7 bar [25 PSI] maximum
17,24 to 20,68 bar
[250 to 300 PSI]
345 bar [5000 PSI] maximum
207 bar [3000 PSI] continuous