Avtodizel ???-238??, Operating Instructions Manual, Page: 238 / 254

238
Cause Remedy
SPONTANEOUSLY DISENGAGING OF RANGE-
SIN AUXILIARE TRANSMISSION
Supplying of compressed air in
cylinder cavity opposite to engaged
gear Replace seal ring of spool and
inlet valve of air-distributor
LOW ENGAGING OR NON-ENGAGING OF RANGES IN
AUXILIARY TRANSMISSION AT NEUTRAL POSITION
OF BASE GEARBOX LEVER. SIGNAL LAMP IS ON
FOR LONG TIME, AIR LEAKS THROUGH AIR-
DISTRIBUTOR BREATHER
Inlet valve rubber worn
Inlet valve spring broken
Inlet valve seal ring worn
Bad mating of inlet valve to case
Jamming of inlet valve in pressed
out position
Wearing or hardening of work cyl-
inder seals Replace valve
Replace spring
Replace ring
Replace damaged parts
Clean and oil valve stem, if
necessary, polish it
Replace seals
LOW ENGAGING OR NON-ENGAGING OF RANGES IN
AUXILIARY TRANSMISSION AT NEUTRAL POSITION
OF BASE GEARBOX LEVER. SIGNAL LAMP IS ON
FOR LONG TIME, AIR LEAKS THROUGH TOP
COVER BREATHER
Air-distributor membrane damaged
Wearing or hardening of work cyl-
inder seal rings in hole of shifting
fork rod Replace membrane
Replace seal ring
AIR LEAKAGE THROUGH AIR-DISTRIBUTOR
BREATHER AT ENGAGED GEAR IN BASE GEARBOX
Inlet valve rubber worn
Bad mating of pusher to inlet valve Replace valve
Replace damaged parts