Troubleshooting
The chart that follows contains information to assist in
troubleshooting. There may possibly be more than one
cause for a machine malfunction.
NOTE: See Sauer–Danfoss (Sundstrand) 15 Series
Service Manual and Sauer–Danfoss Steering Unit Type
OSPM Service Manual (Sand Pro 5040 and Infield Pro
5040)
at the end of this chapter for additional trouble-
Refer to the Testing section of this Chapter for precau-
tions and specific hydraulic test procedures.
shooting information regarding the hydraulic system.
Problem
Possible Cause
Fitting(s), hose(s) or tube(s) are loose or damaged.
Hydraulic oil leaks from system.
O–ring(s) or seal(s) are missing or damaged.
Hydraulic oil level in tank is low.
Hydraulic fluid foams.
Hydraulic system is contaminated with water.
Hydraulic system has wrong type of oil.
The pump suction line has an air leak.
Hydraulic oil level in tank is low.
Hydraulic system operates hot.
Transmission pressure is high due to excessive traction load.
Hydraulic oil is contaminated or oil viscosity is too light.
Oil cooler is damaged or plugged.
Hydraulic oil filter is plugged.
Charge pump (P2) pressure is low.
Charge check valve in hydrostat is stuck or faulty.
Accelerator valves in hydrostat are faulty.
Shuttle valve in LH rear wheel motor is stuck or faulty.
Wheel motor(s) is (are) worn or damaged.
Charge pump (P2) is worn or damaged.
Hydrostat is worn or damaged.
Neutral is difficult to find or unit oper-
ates in one direction only.
External pump control linkage is misadjusted, disconnected, bind-
ing or damaged.
Charge check valve in hydrostat is stuck or faulty.
Acceleration valves in hydrostat are faulty.
Hydrostat is worn or damaged.
Sand Pro & Infield Pro 3040/5040
Page 4 – 19
Hydraulic System
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