Procedure for Steering Cylinder Internal Leakage
Test (Sand Pro 5040 and Infield Pro 5040):
1
NOTE: Steering on Sand Pro 5040 and Infield Pro 5040
machines will be affected by incorrect front tire pressure,
binding in the hydraulic steering cylinder, excessive
weight on the vehicle and/or binding of the castor fork
assembly. Make sure that these items are checked be-
fore proceeding with any hydraulic testing, disassembly
or repairs.
1.
Make sure hydraulic oil is at normal operating tem-
2
perature by operating the machine for approximately 10
minutes. Make sure the hydraulic tank is full.
Figure 29
2.
lowered. Make sure engine is off and the parking brake
is engaged.
Park machine on a level surface with the attachment
1.
Steering cylinder
2.
Rod end fitting
3.
Read Precautions for Hydraulic Testing.
4.
Pump (P2) Flow tests to make sure that relief valve and
pump are functioning correctly.
Perform the Implement Relief Pressure and Gear
5.
Determine if the steering cylinder has internal leak-
age using the following procedure:
A. Turn the steering wheel all the way to the right
(clockwise) so the steering cylinder rod is fully exten-
ded.
IMPORTANT: Make sure to thoroughly clean
around all hydraulic connections that will be dis-
assembled.
B. Remove hydraulic hose from the 90o fitting on the
rod end of the steering cylinder (Fig. 29). Plug the
end of the hose.
C. With the engine off, continue turning the steering
wheel to the right (clockwise) with the steering cylin-
der fully extended. Observe the open fitting on the
steering cylinder as the steering 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 must be repaired or replaced.
D. Remove plug from the hydraulic hose. Recon-
nect hose to the steering cylinder fitting.
6.
If steering problem exists and steering cylinder
tested acceptably, steering control valve requires ser-
vice (see Steering Control Valve and Steering Control
Valve Service in the Service and Repairs section).
Sand Pro & Infield Pro 3040/5040
Page 4 – 33
Hydraulic System
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