Procedure for Steering Control Valve Test
1.
Make sure the hydraulic tank is full.
2.
peraturebyoperatingthemachineforapproximatelyten
Make sure hydraulic oil is at normal operating tem-
(10)
minutes.
3.
Drive machine slowly in a figure eight on a flat level
surface.
REMOVE
THIS HOSE
A. There 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.
Figure 21
4.
wheel with small quick movements in both directions.
Let go of the steering wheel after each movement.
Stop the unit with the engine running. Turn steering
CAUTION
A. The steering wheel must go back immediately to
the neutral position.
Before continuing further, read and become fa-
miliar with Precautions for Hydraulic Testing.
B. The steering wheel should not continue to turn.
D. Read Precautions for Hydraulic Testing.
Note:
more than 45 in--lb (5.1 N--m) of torque.
The steering wheel must be able to turn with no
E. Remove hydraulic hosefromthe90ofittingonthe
rod end of the steering cylinder. Plug the end of the
hose.
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
binding of the steering fork assembly. Make sure that
these items arechecked before proceeding with anyhy-
draulic testing procedure.
F. With the engine off, continue turning the steering
wheel to the left (counterclockwise) with the steering
cylinder fully extended. Observe the open fitting on
the steering cylinder as the steering wheel is turned.
Ifoilcomes outofthe fitting while turning thesteering
wheel to the left, the steering cylinder has internal
leakage and must be repaired or replaced.
5.
and Gear Pump (P2) Flow tests to make sure that relief
valve and gear pump are functioning correctly.
Perform the Implement Relief Valve (R5) Pressure
G. Remove plug from the hydraulic hose. Recon-
nect hose to the steering cylinder fitting.
6.
If either of these performance tests indicate a steer-
ing problem, determine if the steering cylinder is faulty
using the following procedure.
7.
If steering problem exists and steering cylinder
tested acceptably, steering control valve requires ser-
vice (see Steering Control Valve and Steering Control
Valve Service).
A. Park machine on a level surface with the cutting
unitsloweredandoff.Makesureengineisoffandthe
parking brake is engaged.
B. Turn the steering wheel all the way to the left
(counterclockwise) sothesteering cylinder rod isful-
ly extended.
C. Turn engine off.
Greensmaster 3250--D
Page 4 -- 51
Hydraulic System (Rev. I)
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| Language | English |
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