KIROVETS K-744R1, K-744R2, K-744R3, K-744R4 tractors
159
10 TROUBLESHOOTING
Fault
Remedy
Transmission fault
Increased heating of the pump drive
reducer: absence of lubricant, clogging of
oil channels.
Clean the oil supply channels
Oil pressure in the gearbox is missing or
insufficient:
Oil leak in oil pipeline connections.
Eliminate the leak.
Decreased oil level in gearbox.
Refill oil.
Oil pressure sensor or gauge is faulty.
Replace it.
Sticking of the pressure valve of the hydraulic
system.
Wash up and adjust the pressure valve. Perform
adjustment of the pressure valve at nominal
rotational speed of the engine on any of gears
for the pressure of 11
–12 kgf/cm
2
by screwing
the plug. Perform monitoring by manometer of
the class not less than 2.5 with the limit
measurement scale of 15
–20 kgf/cm
2
.
The oil pressure in the GB hydraulic system at
the engine crankshaft rotational speed of 900
–
1,800 RPM shall be 1.0
–1.2 MPa (10–12
kgf/cm
2
) for K-744R1, K-744R2 tractors and 1.1
–1.3 MPa (11–13 kgf/cm
2
)for K-744R3, K-744R4
tractors at the engine crankshaft rotational speed
of900
–1,800 RPM.
The oil pressure growth on each gear shall be
fast. The pressure on neutral and in engagement
of synchroniser brake shall not be less than on
transmission gears.
Loss of performance of the gearbox pump.
Check and adjust pressure in accordance with
Item 6.9. If necessary, replace the pump.
Increased noise in the pressure valve area
at the Neutral position of gear change
lever with the full shift of drain pedal.
Check the oil level in gearbox. During installation
of PTO on the tractor, perform the level check
with PTO being engaged.
Continuous increase of the oil level in
gearbox, oil throwing from the gearbox
breather tube, fast overheating of oil in
gearbox, loss of power (oil overflow in GB
due to “leakage” from the hydraulic tank
through PDR pump seals).
Determine the pump with “leakage”, eliminate
the fault by means of replacement or repair.
Tractor “deformation” with the main shaft
geared clutch being engaged at the gear
change lever position of “actuation of
synchroniser brakes”:
Disc warping.
Replace the discs.
Wear of synchroniser brake blocks.
Replace the synchroniser brake blocks.
Adjustment of the drain gate valve control
drive:
Slow return of the drain pedal. Increase of the
shifting force, jamming at changeover N-1, 1-
N with the drain pedal being fully shifted.
Drain pedal hanging up on the 1st gear.
Adjust the drain pedal drive. With the wire rope
drive being adjusted correctly, the drain pedal in
the depressed position shall rest against the bolt
at the gear-shift mechanism (GSM) drain lever
being turned up to the stop in the clockwise
direction. With the drain pedal being released,
