Toro Groundsmaster 4100-D Service Manual page 99

Procedure for Steering Cylinder Internal Leakage
Test
NOTE: Steering circuit operation will be affected by
rear tire pressure, binding of steering cylinder, extra
weight on the vehicle and/or binding of rear axle steering
components. Make sure that these items are checked
before proceeding with steering cylinder internal leak-
age test.
1. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine under load for
approximately ten (10) minutes. Make sure the hydrau-
lic tank is full.
2. Park machine on a level surface with the cutting deck
lowered and off. Make sure engine is off and the parking
brake is applied.
CAUTION
Prevent personal injury and/or damage to equip-
ment. Read all WARNINGS, CAUTIONS and Pre-
cautions for Hydraulic Testing at the beginning
of this section.
3. Turn the steering wheel for a right turn so that the
steering cylinder rod is fully extended.
4. Thoroughly clean the area around the hydraulic hose
at the rod end of the steering cylinder.
5. Place a drain pan under the steering cylinder. Re-
move hydraulic hose from the fitting on the rod end of the
steering cylinder. Install a steel plug in the disconnected
hose.
Groundsmaster 4100--D/4110--D
6. Remove all hydraulic oil from drain pan. Make sure
that empty drain pan remains under the open fitting of
the steering cylinder.
7. 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 steer-
ing cylinder has internal leakage and must be repaired
(see Steering Cylinder and Steering Cylinder Service in
the Service and Repairs section of this chapter). Check
drain pan for any evidence of oil that would indicate cyl-
inder leakage.
8. After testing is completed, remove plug from the hy-
draulic hose. Connect hose to the steering cylinder fit-
ting.
9. If a steering problem exists and the steering cylinder
tested acceptably, consider the following:
A. Steering and lift/lower gear pump section is worn
or damaged (see Steering and Lift/Lower Gear
Pump Flow Test in this section).
NOTE: If steering and lift/lower gear pump section
is worn or damaged, charge, steering and lift circuits
will all be affected.
B. The flow divider in the fan drive control manifold is
faulty (see Fan Drive Manifold Service in the Service
and Repairs section of this chapter).
C. The steering control valve requires service (see
Steering Control Valve and Steering Control Valve
Service in the Service and Repairs section of this
chapter).
10.Check oil level in hydraulic reservoir and adjust if
needed.
Page 4 - - 61 Hydraulic System