KIROVETS K-744R1, K-744R2, K-744R3, K-744R4 tractors
171
9 TROUBLESHOOTING
Fault
Troubleshooting
Transmission faults
Increased heating of the pump drive reducer: no
grease, clogging of oil channels.
Clean the oil supply channels
No or insufficient oil pressure in the gearbox:
Oil leak at oil pipeline connections.
Eliminate the leak.
Decreased oil level in GB.
Refill oil.
Oil pressure sensor or gauge is faulty.
Replace it.
Hydraulic system pressure valve is stuck.
Wash up and adjust the pressure valve. Adjust the
pressure valve with rated engine speed at any gear for
the pressure of 11-12 kgf/cm
2
by screwing the plug in.
Use pressure gauge of at least 2.5 class with the
measurement scale limit of 15-20 kgf/cm
2
.
Oil pressure in the GB hydraulic system at gears with
the engine crankshaft speed of 1800 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
speed of 900-1800 RPM.
Oil pressure growth at each gear shall be rapid. The
pressure on neutral gear and at engagement of
synchroniser brakes shall not be less than on
transmission gears.
Loss of GB pump performance.
Check and adjust pressure in accordance with item 6.9. If
necessary, replace the pump.
increased noise at the pressure valve area when
the gear change lever is in Neutral position or
with the drain pedal fully pressed.
Check the oil level in GB. If the tractor is equipped with
PTO, perform the level check with PTO engaged.
Constant increase of the oil level in gearbox, oil
discharge from the GB breather tube, rapid over-
heating of oil in GB, loss of power (GB overfilling
with oil due to “overflow” from the hydraulic tank
through PDR pump seals).
Find the pump with “overflow”, perform a replacement or
repair to eliminate the flow.
Tractor imbalance with the load shaft gear cou-
pling engaged and the gear change lever in “actu-
ation of synchroniser brakes” position:
Disc warping.
Replace the discs.
Wear of synchroniser brake shoes.
Replace the synchroniser brake shoes.
