Troubleshooting
The cause of an improperly functioning hydraulic sys-
tem is best diagnosed with the use of proper testing
equipment and a thorough understanding of the com-
plete hydraulic system.
Continued use of an improperly functioning hydraulic
system could lead to extensive internal component
damage.
The chart that follows contains information to assist in
troubleshooting. There may possibly be more than one
cause for a machine malfunction.
A hydraulic system with an excessive increase in heat
or noise has a potential for failure. Should either of these
conditions be noticed, immediately stop the machine,
turn off the engine, locate the cause of the trouble, and
correct it before allowing the machine to be used again.
Refer to the Testing section of this Chapter for precau-
tions and specific test procedures.
Problem
Possible Cause
Fitting(s), hose(s), or tube(s) are loose or damaged.
Hydraulic oil leaks
O–ring(s) or seal(s) are missing or damaged.
Oil level in transaxle is incorrect.
Foaming hydraulic fluid
Hydraulic system has wrong kind of oil.
Hydraulic oil is contaminated.
The steering pump suction line has an air leak.
Oil level in transaxle is incorrect.
Hydraulic system operates hot
Suction screen in transaxle is loose or clogged.
Hydraulic hose is kinked.
Hydraulic oil is contaminated or incorrect viscosity.
Oil constantly forced over relief.
Steering pump is worn or damaged.
Transaxle or drive train problem (see Drive Train – Chapter 7).
Engine speed is too low.
Steering inoperative or sluggish
Pump pulley drive belt is loose.
Steering cylinder is binding.
Transaxle oil level is low.
Steering relief valve is stuck open.
Steering control valve is worn or damaged.
Pulley key (either on engine or pump) is sheared.
Steering cylinder leaks internally.
Steering pump is worn or damaged.
Hydraulic System
Page 4 – 10
Multi Pro 1200/1250
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