Toro groundsmaster 455-D - Machine Travels in One Direction Only; System Operates Hot; Troubleshooting

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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 no
ise is a potential 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
dama
ge.
The charts that follow contain detailed information to
assist in troubleshooting. There may possibly be more
than one cause for a machine malfunction. All causes
should be checked in the order in which they are listed
on the charts.
Refer to the Testing section of this Chapter for precau-
tions a
nd specific test procedures.
System Operates Hot
Cause Correction
Cooling system not operating properly. Clean screen, oil cooler & radiator. Repair fan or belt.
Ch
eck coolant level and add coolant if necessary.
Make sure radiator screen is properly sealed.
Low engine RPM. Adjust - use tachometer.
Hydraulic oil level too low. Fill to proper level.
Kinked or severely bent hose or tubing. Replace kinked or bent hose or tubing.
Traction circuit working pressure too Inspect brakes for binding and adjust or repair if
h
igh - TEST NO. 1. necessary.
Check for other cause of excessive machine load
and correct.
Damaged pump or motor(s). Repair or replace pump or motor(s).
Hydraulic System
Machine Travels In One Direction Only
Cause Correction
Traction control linkage damaged or out of Repair control linkage.
adj
ustment.
Pump charge check/relief valves defective. Inspect and clean or replace pump check/relief
va
lves.
Groundsmaster
®
455-D Page 4 - 13 Troubleshooting