MTW BELARUS 952.5, Руководство оператора

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952.5-0000010 OM
181
Table 6.1 continued
Malfunction, external manifestation Troubleshooting
Pressure in the cylinder drops fast upon diesel shut down
Air leakage along pneumatic system connect-
ing elements Eliminate leakage
Pressure in the cylinder reduces quickly upon pressing brakes
Brake valve inlet valve is askew,
clogged or damaged Eliminate skewness, clean the valve or
replace it
Damaged diaphragm of the brake valve. Replace diaphragm .
Insufficient pressure in the cylinder
Air leakage. Eliminate air leakage.
Disturbed operation of pressure regulator. Adjust pressure regulator.
Defective inlet and delivery valves of the
compressor Correct the compressor trouble
Great wear of piston rings, hang up of com-
pressor rings Correct the compressor trouble
Compressor ejects oil in the pneumatic system
Hang up or wear of compressor piston rings. Correct the compressor trouble
Pressure regulator switches on controller to idle run at pressure less than 0.77...0.80
MPa (7.7...8.0 kgf/cm
2
),and to operation mode — at less than 0.65 MPa (6.5 kgf/cm
2
), or
over 0.70 MPa (7.0 kgf/cm
2
)
Staining of cavities and ducts of pressure
regulator Wash and clean them
Unlocking of adjustment cover. Adjust pressure of compressor switching
on/off
Loss of elasticity, damage or breakage of
rubber parts, spring shrinkage Replace damaged parts
Skewness, hang up of controller regulating
section Check valves mobility, put grease, if required
Pressure regulator is often actuated (switches compressor on) without air in-
take from the receiver
Air leakage from pneumatic system or pres-
sure regulator, or damage of the controller
check valve Find out and eliminate air leakage
Regulator operates in the safety valve mode
Adjusting cover is screwed up to great value Adjust controller
Jamming of discharge piston of the dia-
phragm unit
Disassembly pressure controller and elimi-
nate jamming
No clearance between relief valve and lower
cover, cover outlet openings are clogged Unscrew cover, clean outlet openings and
check for clearance
No air supply to connecting hose via air bleed off valve
Rod of air bleed off valve in the pressure
controller is not sunk enough. Screw up connecting hose nut to the
coupling to the full.
Pressure controller has switched
compressor over to idle run Reduce cylinder pressure to below 0.65 Mpa
(6.5 kgf/cm
2
)
Displacement of rubber ring on the
air bleed off valve Unscrew the cover, check position and state
of rubber ring.