Toro groundsmaster 455-D - Cutting Unit(S) Lower or Raise too Quickly; Steering Loss

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Cutting Unit Lowers or Raises Too Quickly
Cause Correction
Missing or improperly installed orifice in hydraulic Properly install orifice between left valve and
lin
e. hydraulic hose to hydraulic lift cylinder(s). NOTE:
Orifice mus
t be installed to avoid interference with
adapter fitting.
Steering Loss
Cause Correction
Steering linkage or cylinder pivots damaged, worn, Lubricate bushings. Inspect for damage. Repair or
or
binding. replace damaged parts.
Low steering pressure - TEST NO. 4. Check for restriction in pump intake line or strainer
and
repair if necessary.
Check steering cylinder for internal leakage and
repair or replace if necessary.
Clean relief valve in steering pump and adjust or
replace if necessary.
Inspect steering/lift pump for wear or damage and
repair or replace if necessary.
Steering control unit faulty. Repair or replace steering control unit.
NOTE: Steering loss after washing machine can be the result of “thermal shock”. Normal functions will return after
ste
ering control unit temperature stabilizes. To prevent damage to steering control unit, DO NOT attempt to turn
steering wheel until temperature stabilizes when thermal shock is noted.
Troubleshooting P
age 4 - 18 Groundsmaster
®
455-D