Toro Groundsmaster 4500-D Series Service Manual page 177

Procedure for Steering Cylinder Internal Leakage Test (continued)
Groundsmaster ® 4500-D/4700-D
19245SL Rev A
Prevent personal injury and/or damage to equipment. Read all
WARNINGS, CAUTIONS and Precautions for Hydraulic Testing at the
beginning of this section.
1. Park machine on a level surface with the cutting decks lowered and off.
Make sure hydraulic oil is at normal operating temperature, engine is off and
the parking brake is applied.
2. Turn the steering wheel for a right turn so that the steering cylinder rod
is fully extended.
3. Thoroughly clean the area around the hydraulic hose at the rod end of the
steering cylinder.
4. Place a drain pan under the steering cylinder. Remove hydraulic hose from
the fitting on the rod end of the steering cylinder. Install a steel plug in the
disconnected hose. Leave cylinder fitting open.
5. Remove all hydraulic oil from drain pan. Make sure that empty drain pan
remains under the open fitting of the steering cylinder.
6. With the engine off, turn the steering wheel for a right turn. Observe the open
fitting on the extended steering cylinder as the steering wheel is turned.
If oil comes out of the fitting while turning the steering wheel, the steering
cylinder has internal leakage and must be repaired (see
Service (page 5–144)). Check drain pan for any evidence of oil that would
indicate cylinder leakage.
7. If a steering problem exists and the steering cylinder tested acceptably, the
steering control valve requires service (see
(page 5–141)).
8. After testing is completed, remove plug from the hydraulic hose. Connect
hose to the steering cylinder fitting.
9. Check oil level in hydraulic reservoir and adjust if needed.
CAUTION
Page 5–75
Steering Cylinder
Steering Control Valve Service
Hydraulic System: Testing