Cutting Unit(S) Lower Or Raise Too Quickly; Steering Loss - Toro Groundsmaster 455-D Service Manual

Cutting Unit Lowers or Raises Too Quickly
Cause
__________________________________________________________________________________________
Missing or improperly installed orifice in hydraulic
line.

Steering Loss

Cause
__________________________________________________________________________________________
Steering linkage or cylinder pivots damaged, worn,
or binding.
________________________________________________________________________________________________________________________________________________________
Low steering pressure - TEST NO. 4.
________________________________________________________________________________________________________________________________________________________
Steering control unit faulty.
NOTE: Steering loss after washing machine can be the result of "thermal shock". Normal functions will return after
steering 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
Correction
Properly install orifice between left valve and
hydraulic hose to hydraulic lift cylinder(s). NOTE:
Orifice must be installed to avoid interference with
adapter fitting.
Correction
Lubricate bushings. Inspect for damage. Repair or
replace damaged parts.
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.
Repair or replace steering control unit.
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Groundsmaster 455-D