Manitowoc Grove TMS700E Service And Maintenance Manual page 266

UNDERCARRIAGE
Symptom
17. Darting, wandering, oversteering.
Darting, wandering, oversteering.
(continued)
18. Excessive backlash, freeplay.
19. Steering input not smooth.
NOTE: *With the vehicle stationary and engine at idle, place the torque wrench on the steering wheel retaining nut and
steer from lock to lock. A reading of more than 1.7 Nm (15 lb-in) means improper phasing. To correct, rotate the
intermediate steering shaft one spline at a time until the torque reads the same throughout the 360 degree
rotation.
FUNCTIONAL CHECK
A periodic functional check of the power steering system will
generally be adequate to ensure satisfactory service.
1. Check all fittings for leakage. Accumulation of moist,
black dirt is a good indication of leakage
2. Turn the steering wheel through the full range with the
engine running at both idle and full throttle. Do this with
8-14
Probable Cause
e. King pins seized or binding.
f. Oil flow rate incorrect.
a. Oil flow too high.
b. Air trapped in steering gear.
c. Looseness, worn front end
parts.
d. Front end alignment
correct.
e. Overloading.
f. Rear axle not parallel.
g. Tight tie rod ends and drag
link sockets.
a. Worn universal joint.
b. Rack on piston damaged.
c. Damaged sector
splines.
d. Worn or damaged pitman arm
splines.
e. Universal joint yoke loose on
actuating shaft.
a. Worn universal joint.
b. Lack of lubrication.
c. Universal joints not phased
properly.
d. Low oil flow.
e. Pump cavitation.
f. Overheating.
the machine stationary and moving. Note any speed
irregularities and sticky sensation. This may indicate dirt
in the fluid. If the steering wheel continues to rotate
when started and released, a condition known as
motoring exists. This may also indicate dirt in the fluid.
3. Ensure the system has adequate power. If there is an
indication of hard steering, this can be caused by either
a reduced oil flow to the control valve or a reduced
system relief pressure. Adequate oil pressure can only
Published 01-29-2015, Control # 512-01
TMS700E SERVICE MANUAL
Solution
e. Repair or replace.
f. Check and correct supply
pump.
a. Supply
specifications.
b. Bleed system.
c. Check and repair as required.
not d. Align front end - Caster.
e. Reduce loads.
f. Check and repair as required.
g. Check rotational torque and
replace if necessary.
a. Replace universal joint.
b. Replace steering gear.
shaft/ c. Replace steering gear.
d. Replace pitman arm and/or
sector shaft.
e. Repair or replace damaged
parts.
a. Check
required.
b. Lubricate per lube chart.
c. Re-phase columns.
d. Idle speed to slow or supply
pump not to specifications.
e. Correct pump supply.
f. Correct cause of overheating.
pump not to
and replace as