Groundsmaster 4100--D/4110--D Hydraulic SystemPage 4 -- 61
Procedure for Steering Cylinder Internal Leakage
Test
NOTE: Steering circuit operation will be affected by
rear tire pressure, binding of steering cylinder, extra
weightonthevehicleand/orbindingofrearaxlesteering
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. Parkmachineonalevelsurfacewiththecuttingdeck
loweredandoff.Makesureengineisoffandtheparking
brake is applied.
CAUTION
Prevent personalinjury 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. Thoroughlycleantheareaaroundthehydraulichose
at the rod end of the steering cylinder.
5. Place a drain pan under the steering cylinder. Re-
movehydraulichosefromthefittingontherodendofthe
steeringcylinder.Installasteelpluginthedisconnected
hose.
6. Remove all hydraulic oil from drain pan. Make sure
that empty drain pan remains under the open fitting of
the steering cylinder.
7. Withtheengineoff,turnthesteeringwheelforaright
turn. Observe the open fitting on the extended steering
cylinder as the steering wheel is turned. Ifoilcomes out
of the fitting while turning the steering wheel, the steer-
ing cylinder has internal leakage and must be repaired
(seeSteeringCylinder and Steering CylinderServicein
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 asteeringproblem exists andthesteering 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
isworn ordamaged,charge, steeringandliftcircuits
will all be affected.
B. Theflowdividerinthefandrivecontrolmanifoldis
faulty(seeFanDriveManifoldServiceintheService
and Repairs section of this chapter).
C. The steering control valve requires service (see
Steering C ontrol 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.
Hydraulic
System
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