TROUBLE, EXTERNAL MANIFESTATION
Rear PTO does not transfer full torsion torque(slips)
Maladjustment of the control mechanism due to con -
siderable wear of the friction linings of the brake band
or owing to other reason.
Adjust the PTO control mechanism.
Unclear switching of the PTO control lever (occur-
rence of jamming, resting-against, clogging, etc. in
mechanism joints).
Eliminate the reasons hampering the free movement of
the control mechanism parts. The control lever must be
clearly fixed in positions “PTO ON” – “PTO OFF”.
The front axle fails to engage automatically during the rear wheel slipping, when the tractor
moves forward
The parts of the free running coupling of the transfer
box are worn out.
Replace the free running coupling.
The jamming slots of the external casing of the free
running clutch are clogged with the products of oil
oxidation and part wear.
Remove the coupling and wash its parts.
The springs of the roller pressing mechanism are de-
formed.
The safety coupling in the intermediate support does
not transfer the required torque.
Adjust the coupling for transferring the torque of
50...70 kgf-m (500…700 N∙m) by tightening the col-
lar nut from the transfer box side.
The driving and driven plates of the safety coupling
are worn out.
The disk springs have lost resilience or got broken.
Transfer box control rod has increased length.
Adjust the rods length as described in Chapter E.
Adjustments.
Quick wear and pealing of front wheel tires
Non-compliance of air pressure in the tyres of the
front and rear wheels with the recommended
norms.
To prevent faults, maintain the air pressure in the
tyres of the front and rear wheels according to the
recommended norms.
Misalignment of the wheel toe-in.
The FDA is constantly engaged due to breakage or
jamming in transfer box control.
Perform the adjustment.
Check the forced engagement of the FDA. Eliminate
the fault. Adjust transfer box control mechanism.
HYDRAULIC VOLUMETRIC STEERING SYSTEM (SS)
Higher force on steering wheel
Insufficient oil pressure in SS hydraulic system. The
feed pump is faulty.
Have the pump repaired or replace it.
Insufficient quantity of oil in the tank.
Increased friction between mechanical parts of the
steering column
Absence of stop when rotating the steering wheel
Insufficient quantity of oil in the tank.
Add oil and bleed the system.
Spontaneous rotation of the steering wheel (“motoring”) when operator’s impact is re-
moved from it
Failure of the metering pump spool to return to neu -
tral position.
a) blocking-up the spline shank of steering column
cardan in the metering pump drive shaft
Adjust the steering column.
b) increased friction between mechanical parts of the
steering column.
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