Toro GroundsmasterR 4300-D Service Manual page 91

Procedure for Steering Cylinder Internal Leakage
Test:
1. Make sure hydraulic oil is at normal operating tem-
perature.
2. Park machine on a level surface with the cutting
decks lowered and PTO switch off. Make sure engine is
off. Apply the parking brake.
3. Read Precautions For Hydraulic Testing.
CAUTION
Before opening hydraulic system, operate all hy-
draulic controls to relieve system pressure and
avoid injury from pressurized hydraulic oil. See
Relieving Hydraulic System Pressure in the Gen-
eral Information section of this chapter.
4. Turn the steering wheel for a right turn (clockwise) so
the steering cylinder rod is fully extended.
5. Thoroughly clean the area around the hydraulic hose
at the rod end of the steering cylinder (Fig. 62).
6. Place a drain pan under the steering cylinder. Re-
move hydraulic hose from the fitting on the rod end of the
steering cylinder. Cap the end of the hose.
7. Remove all hydraulic oil from drain pan. Make sure
that empty drain pan remains under the open fitting of
the steering cylinder.
8. With the engine off, continue turning the steering
wheel for a right turn (clockwise) with the steering cylin-
der fully extended. Observe the open fitting on the steer-
ing cylinder as the wheel is turned. If oil comes out of the
fitting while turning the steering wheel to the right, the
steering cylinder has internal leakage and should be in-
spected and repaired (see Steering Cylinder and Steer-
ing Cylinder Service in the Service and Repairs section
of this chapter). Check drain pan for any evidence of oil
that would indicate internal cylinder leakage.
9. Remove plug from the hydraulic hose. Connect hose
to the steering cylinder fitting.
10.If a steering problem exists and the steering cylinder
tested acceptably, the steering control valve requires
service (see Steering Control Valve and Steering Con-
trol Valve Service in the Service and Repairs section of
this chapter).
11. Check oil level in hydraulic reservoir and adjust if
needed.
Groundsmaster 4300--D
1. Steering cylinder
Page 4 - - 59
1
2
Figure 62
2. Rod end fitting
Hydraulic System