504G3
SERIES TRACTOR OPERATION MANUAL
86
(2) The PTO has no power
① The driven plate lining in the hydraulic
cluch abraded heavily or the abrasion lean
to one side
② The valve is broken
③ The hydraulic cluch leaks heavily
① Replace
② Replace
③ Replace
(3) The PTO can’t be separated completely
① The button is broken
② The driven plate lining in the hydraulic
cluch has been locked up
③ Return spring of the hydraulic clutch is
broken
① Check the button
② Check and repair
③ Replace
7.9 Hydraulic Hitch System
Troubles & possible causes Fixing methods
(1) Cannot lift whenever light load or heavy
load
① Oil returning valve block at open position
② Gear pump does not work
a) Oil level in the lifter is too low
b) Filter net blocked seriously
① Check and clean valve
②
a) Replenish oil to specified
level
b) Clean or replace net
(2) Lift up if light load,unable lift or lift
slowly when with heavy load
① Gear pump abraded seriously
② Any of the valves leaks
③ Seal rings of the oil intake pipe or the
pump is broken
① Fix or replace the pump
② Check, clean and repair it
③ Replce
(3) Implement shivering during lifting, Static
sink goes fast
① Distributor single direction valve seal
poorly
② Sink valve seal poorly
③ Oil cylinder safety valve leak
④ The hydraulic output has been jammed to
seal badly
⑤ Sink speed control valve is damaged to
leak
⑥ O ring of oil cylinder pistion damage to
leak
① Clean and repair if needed
② As the same
③ As the same
④ As the same
⑤ Replace
⑥ Replace
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