Service manual

Section 10. Common troubles and their remedies
Belarus 80.1/80.2/82.1/82.2/82Р —Operation and Service Manual
124
Table 14, continued
Trouble, External Symptoms
Remedy
10.2.4. AUTOMATIC DIFFERENTIAL LOCK-UP
Automatic Differential Lock-Up Fails to Operate
Lock-up sensor spool valve stuck.
Remove the sensor; wash in diesel fuel or replace it.
Low oil pressure applied to the lock-up actuating
mechanism (ADL clutch).
(a) pressure-reducing valve setting disturbed;
(b) excessive oil leaks in lock-up sensir.
 Replace the pressure-reducing valve spring.
Caulk the valve seat
 Replace lock-up sensor.
ADL clutch disks soiled and fouled.
Wash the clutch disks in gasoline; stop oil leaks.
Clutch disk friction linings worn-out.
Replace the friction linings or disks in assembly.
10.2.5. BRAKES
Unsatisfactory Operation of Brakes (brakes fade)
Brake control setting disturbed.
Adjust brake controls (refer to Subsection 7.6.4).
Brake disk linings fouled or worn-out.
Stop oil leaks. Wash the linings. Replace the disks, if
required.
10.2.6. REAR P.T.O. SHAFT
Rear PTO Shaft Fails to Transfer Torque in Full (the shaft slips)
Control setting disturbed due to excessive wear of
brake band friction linings or to any other reason.
Adjust the P.T.O. control mechanism (refer to Sub-
section 7.6.4).
Sluggish shifting of the P.T.O. control lever (due
to jamming, butts and/or dirt in joints).
Locate and remove causes of malfunction which hin-
der free motion of the control mechanism compo-
nents. The control lever should lock positively in
«P.T.O. Engaged»–«P.T.O. Disengaged» positions.
10.2.7. FRONT DRIVING AXLE
When in Forward Run and with the Rear Wheels Slipping, the Front Driving Axle Would Not
Engage Automatically
Worn-out parts of the transfer case overrunning
clutch.
Replace the overrunning clutch.
Wedged slots in the overrunning clutch outer cage
fouled with oil oxidation and parts wear products.
Remove the clutch and wash clutch parts.
Roller tightening mechanism springs distorted.
Replace the springs.
Safety clutch in the intermediate bearing would
not transfer torque.
Adjust the clutch to transfer torque of 40…80 kgf•m
(400…800 N•m).
Worn-out driven and driving disks of the safety
clutch.
Replace worn-out disks.
Disk springs lost elasticity or broken.
Replace the springs.
FDA drive transfer case control tie-rod maladjust-
ed.
Adjust tie-rod length, to do this:
1. Place the control lever to its upper position («FDA
Force Engaged».
2. Disconnect the tie-rod from transfer case lever and
slacken the fork locknut.
3. Turn the transfer case lever clockwise to the stop.
4. Register holes in the lever and the screw by rotat-
ing the fork, then, insert a pin.
5. Tighten down the locknut and cotter the pin.