504G3
SERIES TRACTOR OPERATION MANUAL
88
④ The carbon brush and the commutator
contact poorly
⑤ Starter motor is broken or shorten
④ Check and adjust carbon brush
spring pressure
⑤ Check and repair
(7) The starter motor starts weakly, and
cannot start the engine
① Bearing abraded seriously and pivot touch
housing
② The carbon brush and the collector
contact poorly
③ The commutator surface is burnt or
stained with oil
④ Wire connect unwell
⑤ The main touch point of electromagnetic
switch burnt out, and have poor contact
⑥ Battery volume is insufficient
① Replace bearing
② Adjust
③ Clean the oil and grind by “0”
model non metal sand paper
④ Fasten joint
⑤ Grind by “0” model non metal
sand paper
⑥ Recharge
(8) Starter motor continue rotate when motor
had started
① Copper disk in the motor relay keep link
with two touch points
② Distance of the copper disk in the motor
relay is improper
① Check and repair
② Adjust
(9) The starter motor rotate befor the gears
are engaged, and cause the gear end hit each
other
Distance of the copper disk in the motor
relay is too small
Adjust
7.11 Heating system
Troubles & possible causes Fixing methods
(1) Heater does not work
① Line break
② Motor damage
③ Heater switch is broken
④ Fuse off
① Overhaul
② Overhaul or replace
③ Overhaul
④ Replace
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