Toro 41188, Service Manual

Page: 64 / 353

Multi Pro 1750 Hydraulic System Page 4 − 16
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.
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.
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.
Refer to the Testing section of this chapter for precau-
tions and specific test procedures.
Problem Possible Cause
Hydraulic oil leaks Fitting(s), hose(s) or tube(s) are loose or damaged.
O−ring(s) or seal(s) are missing or damaged.
Foaming hydraulic fluid Oil level in transaxle is incorrect.
Hydraulic system has wrong kind of oil.
Hydraulic oil is contaminated.
The hydraulic pump suction line has an air leak.
Hydraulic system operates hot (above 200F (93C). Oil level in transaxle is incorrect.
Hydraulic hose is kinked.
Hydraulic oil is contaminated or is wrong kind of oil.
Suction screen in transaxle is loose or clogged.
Oil constantly forced over relief.
Hydraulic pump is worn or damaged (boom lift affected
as well).
Transaxle or drive train problem (see Drive Train −
Chapter 7 in this manual).
Steering and spray booms inoperative Hydraulics enable valve solenoid coil or circuit wiring
has electrical problem (see Chapter 5 − Electrical
System in this manual).
Hydraulic pump is worn or damaged