5-12
GROUP 2 OPERATIONAL CHECKS AND TROUBLESHOOTING
1. OPERATIONAL CHECKS
Check item
Steering wheel
Knuckle
Steering axle
Hydraulic pressure of power
steering
Remove plug from outlet port of flow divider and install oil pressure gauge.
Turn steering wheel fully and check oil pressure.
Oil pressure : 90
kgf/cm
2
(1280
psi
)
Set rear wheels facing straight forward, then turn steering wheel to left and right.
Measure range of steering wheel movement before rear wheel starts to move.
Range should be 30~60
mm
at rim of steering wheel. If play is too large, adjust
at gear box.
Test steering wheel play with engine at idling.
Checking procedure
·
Check knuckle visually or use crack detection method. If the knuckle is bent, the
tire wear is uneven, so check tire wear.
·
Put camber gauge in contact with hub and measure camber.
If camber is not within 0
0.5
; rear axle is bent.
Ask assistant to drive machine at minimum turning radius.
Fit bar and a piece of chalk at outside edge of counterweight to mark line of
turning radius.
If minimum turning radius is not within
100
mm
(
4
in
)of specified value, adjust
turning angle stopper bolt.
Min turning radius(Outside)
·
·
·
·
20L-7, 20G-7
25L-7, 25G-7
30L-7, 30G-7
2252
mm
(89
in
)
2300
mm
(91
in
)
2393
mm
(94in)
22. TROUBLESHOOTING
Problem
Steering wheel drags.
·
Low oil pressure.
·
Bearing faulty.
·
Spring spool faulty.
·
Reaction plunger faulty.
·
Ball-and-screw assembly faulty.
·
Sector shaft adjusting screw excessi-
vely tight.
·
Gears poorly meshing.
·
Flow divider coil spring fatigued.
·
Check lockout. Repair.
·
Clean or replace.
·
Clean or replace.
·
Replace.
·
Clean or replace.
·
Adjust.
·
Check and correct meshing.
·
Replace.
Cause Remedy
Steering wheel fails to return
smoothly.
·
Bearing faulty.
·
Reaction plunger faulty.
·
Ball-and-screw assy faulty
·
Gears poorly meshing.
·
Clean or replace.
·
Replace.
·
Clean or replace.
·
Check and correct meshing.
20LC-7, 20GC-7
25LC-7, 25GC-7
30LC-7, 30GC-7
2038
mm
(80
in
)
2074
mm
(82
in
)
2116
mm
(83
in
)
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