504G3
SERIES TRACTOR OPERATION MANUAL
82
7.2 Gearbox
Troubles & possible causes Fixing methods
(1) There are hum or slap noises in the
gearbox
① The gear abraded heavily, or the tooth face
peels off, or the gear teeth are broke
② Bearing abraded seriously or damaged
③ Improper clearance of bevel transmission
④ Lubricating oil is not enough or does not
conform to the requirement
① Replace gear
② Replace bearing
③ Adjust
④ Fill in enough oil, or replace
lubricating oil
(2) It is difficult to gear, or unable to gear on
① The clutch does not separated completely
② Mesh sleeve end face and gear end face
are abraded seriously, or damaged
① Remedy as per clutch troubles
② Replace or repair
(3) The gear disconnects itself
① Poking fork positioning slot is worn
seriously
② Interlock pin spring pressure isn’t enough
③ Spline of teeth seat are worn
① Adjust or replace poking fork
shaft
② Adjust or replace the spring
③ Replace teeth seat
7.3 Rear axle
Troubles & possible causes Fixing methods
(1) Noise increased in the bevel transmission
① Bearing clearance of the small helical
bevel is too large
② Gear engagement is abnormal
③ Differential shaft abraded and seized
④ The planetary gear or washer abraded
⑤ Differential bearing abraded or damaged
① Adjust
② Adjust
③ Replace
④ Replace gear or washer
⑤ Replace bearing
(2) Bearings of helical bevel pinion and
differential shaft are with high temperature
① Pre-tenstion is too much
② Poor lubrication
① Adjust
② Check oil level, replenish if
need
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