New Holland WorkMaster 50 Service Manual page 484

Problem
"Shiny" - effect. The
steered wheels vibrate.
(Rough tread on tires
gives vibrations)
Steering wheel can be
turned the whole time
without the steered
wheels moving
Steering wheel can be
turned slowly in one or
both directions without
the steered wheels turning
Steering is too slow and
heavy when trying to turn
quickly
Too little steering force
(possibly to one side only)
Leakage at either
input shaft, end cover,
gear-wheel set, housing
or top part
Steering - Steering control
Possible Cause
Air in the steering cylinder
Mechanical connections or wheel bearings
worn
Oil is needed in the tank
Steering cylinder worn
Gear wheel set worn
Spacer across cardan shaft forgotten
One or both anti-cavitation valves are leaky
or are missing in OSPC or OVP/OVR
One or both shock valves are leaky or are
missing in OS PC or OVP/OVR
Insufficient oil supply to steering unit, pump
defective or number of revolutions too low
Relief valve setting too low
Relief valve sticking owing to dirt
Spool in priority valve sticking owing to dirt Clean the valve, check that spool moves
Too weak spring in priority valve
Pump pressure too low
Too little steering cylinder
Piston rod area of the differential cylinder
too large compared with piston diameter
Shaft defective
Screws loose
Washers or O-rings defective
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Correction
Bleed cylinder. Find and remove the rea-
son for air collection
Replace worn parts
Fill with clean oil and bleed the system
Replace or repair cylinder
Replace gear wheel set
Install spacer
Clean or replace defect or missing valves
Clean or replace defective or missing
valves
Replace pump or increase number of revo-
lutions
Adjust valve to correct setting
Clean the valve
easily without spring
Replace spring by a stronger (There are 3
sizes: 4 bar (58 psi), 7 bar (102 psi) and
10 bar (145 psi)
Correct pump pressure
Fit a larger cylinder
Fit cylinder with thinner piston rod or 2 dif-
ferential cylinders
Replace shaft seal
Tighten screws Torque 3-3, t daNm or
steering unit (2, 5-3 daNm)
Replace washers and O-rings