KIROVETS K-744R1, K-744R2, K-744R3, K-744R4 tractors
173
Fault
Troubleshooting
If the time of turn is the same (and is over 5 s), then the
cause of fault is the ingress of foreign particles into the
gap between the throttle and the adjustment screw of the
flow controller. It is necessary to dismantle the flow con-
troller (installed on the left-hand pump in the direction of
tractor travel) and wash its parts in diesel fuel without dis-
turbing the adjustment screw. If the time of turn is still
more than 5 s, it is necessary to replace the pump of
steering control system.
- internal oil overflows over hydraulic cylinder seals;
Replace the hydraulic cylinders with repaired (or new)
ones that have been checked for leak-tightness.
Increased vibrations of tractor semi-frames at
turns on the spot and in motion:
- presence of air in service cavities of hydraulic cylin-
ders and hydraulic units;
By running the engine at the maximum idle run speed,
heat up the hydraulic system to the temperature of 50
–
60°С and pump out the hydraulic system until a smooth
turn of semi-frames and the safety valve are achieved
(reaching the “stop”) by turning the steering wheel to the
right and to the left three revolutions each without achiev-
ing the safety valve (without reaching the “stop”). Perform
the works with the rear axle disengaged. When pumping
out the hydraulic system, turn the steering wheel at the
maximum speed in order to exclude its vibrations. Elimi-
nate any occurring leaks.
- the grade of service oil in the hydraulic system does
not correspond to the specified grade.
Replace oil as per lubrication table.
Excessive free travel of the steering wheel:
- presence of air in the hydraulic system.
Heat and pump out the hydraulic system as mentioned
above.
Faults of the hydraulic system for linkage control
Excessive heating of oil in the hydraulic system:
- insufficient amount of oil;
- fault of oil radiator of the hydraulic system for steer-
ing control.
Refill oil.
Replace the faulty radiator.
The linkage is lifting slowly:
- insufficient amount of oil;
- air inflow in hydraulic pipelines connecting the hy-
draulic tank with the pump.
Refill oil.
Eliminate the air inflow.
- excessive oil leak in the pump, hydraulic distributor;
- Seals of the hydraulic cylinder piston are not leak-
tight enough.
Replace the defective assembly.
Restore the piston seals or replace the hydraulic cylinder.
The handle of hydraulic distributor does not re-
turn to position “Neutral” from position “Lifting”
or “Forced lowering” at the end of operating trav-
el: