7.8 Possible failures of brakes and guidelines for troubleshooting

dicating lamp does not light up, unit does not operate or FPTO can be engaged only for a very short period Pressure loss in FPTO control channel ble failures in the electronic system for rear axle differential lock, front driving axle drive, front power take off shaft control, GB reducing gear and guidelines for troubleshooting” FPTO control valve spool jamming is possible. Check control valve operability by pressing the rubber cap of electromagnet. After pressing the cap cylinder rod must be shifted. If cylinder spool does not move replace the control valve. If the control valve spool moves and cylinder rod remains fixed then check tractor transmission hydraulic fluid pressure. Working pressure should be within 0.9 to 1.2 MPa. In case pressure is below the required value eliminate transmission hydraulic system failure as provided by subsection 7.10 “Possible failures of transmission hydraulic system and guidelines for troubleshooting”

Front PTO does not transmit required power, FPTO shaft end extension is rotating

Operation at lower pressure in transmission hydraulic system, skidding of FPTO band-brake Operation with FPTO at lower pressure in transmission hydraulic system is excluded. Eliminate transmission hydraulic system failure as provided by subsection 7.10 “Possible failures of transmission hydraulic system and guidelines for troubleshooting”

Control cylinder rod is moving but FPTO does not transmit full torque or after FPTO shaft disengagement PTO shaft end extension is still rotating. Cylinder rod overstroke Adjust clearance spaces in bend-brake

FPTO does not transmit full torque or after FPTO shaft disengagement PTO shaft end extension is still rotating

If clearance spaces in bendbrakes are adjusted, then it gives evidence of significant wear of bend-brakes Replace bends of PTO shaft

Noise in FPTO reducing gear

Reducing gear parts breakdown Dismount reducing gear from tractor, replace bearings and parts causing failure

7.8 Possible failures of brakes and guidelines for troubleshooting

List of possible brakes failures and guidelines for troubleshooting are shown in Table 7.8. Table 7.8 Failure, Troubleshooting

external manifestations, cause

Inefficient braking

Increased pedal free travel (increased clearance space between piston and main cylinder piston follower) for forward motion and(or) on tractors “BELARUS1822 .3/2022 .3” for reverse Adjust pedal free travel as indicated in clause 3.8.3 “Service brake adjustment of “BELARUS1822.3/2022.3” and for reverse according to clause 3.8.5 “Service brake adjustment of “BELARUS1822 .3/2022 .3”

Presence of air in hydraulic brake control system for forward motion and(or) on tractors “BELARUS1822 .3/2022 .3” for reverse Hydraulic-brake fluid shortage in hydraulic brake control system tanks or on tractors “BELARUS1822 .3/2022 .3” in the main cylinder housing for reverse

Loss of sealing of work spaces of main and operating cylinders due to damage, wear and tear of cups and O-rings (on tractors “BELARUS-1822 .3/2022 .3” damage of valves is possible) Hydraulic-brake fluid leakage in junctions or pipelines in hydraulic drive system. Air inflow in hydraulic brake control system Clogging of openings in tank fittings (for forward motion) or on tractors “BELARUS1822 .3/2022 .3” in the piston (for reverse) causing depression in main cylinder, as a result of which the air leaks into cylinder through sealing Clogging of pipelines of hydraulic drive system due to dent or clogging

Insufficient brake pedal travel or the pedal strikes against cab wall Circulate hydraulic-brake fluid through the hydraulic brake control system for forward motion and on tractors “BELARUS-1822 .3/2022 .3” for reverse

Bring hydraulic-brake fluid in the main cylinders reservoirs to the required level then circulate brake fluid through the hydraulic brake control system. Circulate the hydraulic system for forward motion and on tractors “BELARUS-1822 .3/2022 .3” for reverse Replace main and operating cylinders cups and Orings in case they are worn out. Check if cylinder bearing surface has sharpened edges, ridges, or pits. Circulate hydraulic-brake fluid through the hydraulic system for forward motion and on tractors “BELARUS-1822 .3/2022 .3” for reverse Tighten up junctions, replace damaged parts, then circulate hydraulic-brake fluid through the hydraulic system for forward motion and on tractors “BELARUS-1822 .3/2022 .3” for reverse Unclog the opening. Circulate hydraulic-brake fluid through the hydraulic system for forward motion and on tractors “BELARUS-1822 .3/2022 .3” for reverse

Replace pipelines. Circulate hydraulic-brake fluid through the hydraulic system for forward motion and on tractors “BELARUS-1822 .3/2022 .3” for reverse Adjust clearance space between piston and piston follower of main cylinder as indicated in 3.8.3 “Service brake adjustment on tractors “BELARUS1822.3/2022.3” and for reverse according to clause 3.8.5 “Service brake adjustment on tractors “BELARUS-1822 .3/2022 .3”. Circulate the hydraulic system for forward motion and for reverse. Stroke of operating brake cylinders 16,18 (figure 3.8.6) and correspondingly levers 15, 17 while pressing the unlocked brake pedals separately with effort (300±30) N shall be from 10 to 12 mm.

Continuation of the Table 7.8 Failure, external manifestations, cause Troubleshooting

No effort on brake pedals Presence of air in the hydraulic system or cups and rings in the main and operating brake cylinders are

Increased operating stroke of brake pedals which can not be adjusted – wear problem of break disks worn out. On tractors “BELARUS1822.3 /2022 .3” valves can be damaged. Replace the cups and O-rings in the main and operating cylinders, and valves. Check if cylinder bearing surface has sharpened edges, ridges, or pits. Bleed the clutch control hydraulic system for forward motion and on tractors “BELARUS1822.3 /2022 .3” for reverse Disassemble brakes, replace worn-out disks. Adjust clearance space in friction couple and pedal operating stroke

Sticking of brakes

Pedal free travel is nil (clearance between piston and piston follower of main cylinder is nil) for forward motion and(or) on tractors “BELARUS-1822.3 /2022 .3” for reverse Adjust pedal free travel as indicated in clause 3.8.3 “Service brake adjustment on tractors “BELARUS1822.3/2022.3” and for reverse according to clause 3.8.5 “Service brake adjustment on tractors “BELARUS -1822.3 /2022 .3”

Sticking of main cylinder pistons (does not go back in its initial position) due to piston cup and O-ring expansion, resulting in closure of compensating port by reason of use of incorrect hydraulic-brake fluid or ingress of mineral oil, petroleum, kerosene, diesel fuel into hydraulic-brake Sticking of main cylinder pistons due to piston cups expansion On tractors “BELARUS1822.3 /2022 .3” cylinder pistons stick due to O-rings expansion Loss of elasticity of the main and operating brake cylinder springs Clogging of compensating port of main cylinder Rinse hydraulic drive system with hydraulic-brake fluid. Replace damaged cups and O-ring in the main and operating cylinders. Replace hydraulicbrake fluid. Circulate hydraulic-brake fluid through the hydraulic system for forward motion and on tractors “BELARUS-1822.3 /2022 .3” for reverse

Replace the springs

Unclog the compensating port of main cylinder and deaerate the system

Table 7.8 finished

Failure, external manifestations, cause Troubleshooting

Uneven braking of left and right wheels

Faulty adjustment of service brakes Adjust brake control for forward motion according to clause 3.8.3 “Adjustment of service brakes on tractors “BELARUS-1822.3/2022.3” and for reverse according to clause 3.8.5 “Adjustment of service brakes on tractors “BELARUS-1822.3 /2022 .3”

Malfunctioning of leveling valves of main brake cylinders Disconnect tube connecting two main brake cylinders, turn back fittings and dismount leveling valves. Replace worn-out parts. Circulate hydraulic-brake fluid through the hydraulic system for forward motion and tractors” for reverse