Greensmaster 3250--D Hydraulic SystemPage 4 -- 4 9
Procedure for Steering Valve
Test
1. Make sure the hydraulic tank is full.
2. Make sure hydraulic oil is at normal operating tem-
peraturebyoperatingthemachineforapproximatelyten
(10) minutes.
3. Drive machine slowly in a figure eight on a flat level
surface.
A. T here should be no shaking or vibration in the
steering wheel or rear wheel.
B. Steering wheel movements should be followed
immediately by a corresponding rear wheel move-
ment without the steering wheel continuing to turn.
4. Stop the unit with the engine running. Turn steering
wheel with small quick movements in both directions.
Let go of the steering wheel after each movement.
A. The steering wheel must go back immediately to
the neutral position.
B. The steering wheel should not continue to turn.
NOTE: Thesteeringwheelshouldbeabletoturnwith
no more than 45 in--lb (5.1 N--m) of input torque.
NOTE: This steering test procedure will be affected by
incorrect rear tire pressure, binding in the hydraulic
steering cylinder, extra weight on the vehicle and/or
bindingof the rear castor forkassembly. Make sure that
theseitemsarecheckedbeforeproceedingwithanyhy-
draulic testing procedure.
5. Perform the Implement Relief Valve Pressure and
Gear Pump (Rear Section)Flow tests to make sure that
relief valve and gear pump are functioning correctly.
6. If either of these performance tests indicate a steer-
ing problem, determine if the steering cylinder is faulty
using the following procedure.
A. Park machine on a level surface with the cutting
units lowered and off. Apply the parking brake.
B. Turnthe steering wheelallthe wayforarightturn
(clockwise) so that the steering cylinder rod is fully
retracted.
C. Tu rn engine off.
Figure 28
REMOVE
THIS HOSE
1. Steering cylinder 2. Rear caster fork
2
1
CAUTION
Before continuing further, read and become fa-
miliar with Precautions for Hydraulic Testing.
D. Read Precautions for Hydraulic Testing.
E. Removehydraulichosefromthe90
o
fittingonthe
ball joint end of the steering cylinder (Fig. 28). Plug
theendofthehosewithasteelcap.
F. With the engine off, continue turning the steering
wheel for a right turn (clockwise) with the steering
cylinder fully retracted. Observe the open fitting on
the steering cylinder as the steering wheel is turned.
If oil comes out of the open fitting while turning the
steering wheel for a right turn, the steering cylinder
has internal leakage and must be repaired or re-
placed.
G. When testingiscompleted,removeplugfromthe
hydraulic hose. Connect hose to the steering cylin-
der fitting.
7. If steering problem exists and steering cylinder
tested acceptably, steering valve requires service (see
Steering Valve and Steering Valve Service in the Ser-
vice and Repairs section of this chapter).
Hydraulic
System
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