Sakai SW800 Series, Руководство по ремонту

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4-410
Fault Finding for Hydraulic and Mechanical Systems
a) Speed not gained in both travel directions.
(2/2)
7
11
Is fault rectified if
high pressure relief
valve is disassem-
bled and cleaned?
YES
NO
YES
NO
NO
YES
Drain oil from front
motor reduction
gear. Are metal par-
ticles noticeable in
oil?
8 YES
NO
Drain oil from rear
motor reduction
gear. Are metal par-
ticles noticeable in
oil?
12
Is amount of drain
in front and rear
motors normal?
YES
NO
9
A
B
Possible cause
Remedy
Front wheel drive motor
reduction gear damaged.
Front drive motor damaged.
Rear drive motor reduction
gear damaged.
Rear motor damaged.
Does charge pressure
return to normal with
front motor ports (A
and B) blocked (un-
loader valve opened)?
Propulsion pump perfor-
mance lowered.
Propulsion motor performance
lowered.
Cut off valve faulty.
High pressure relief valve
faulty.
Leakage at sliding portions
(such as piston) of front
motor.
NO
Repair. Renew
as necessary.
Repair. Renew
as necessary.
Repair. Renew
as necessary.
Repair. Renew
as necessary.
Repair. Renew
as necessary.
* Due to difficulty in deciding checking
sequence, a ‘YES’ line on this page carries
three checking items.
• Generally, checking items with smaller refer-
ence number have higher probability.
YES
10
Is fault rectified if
cut off valve is dis-
assembled and
cleaned?
Repair. Renew
as necessary.
Repair. Renew
as necessary.
Clean and adjust.
Renew if
necessary.
Clean and adjust.
Renew if
necessary.
Repair. Renew
as necessary. Leakage at sliding portions
(such as piston) of rear motor.
*See Standard Value
Chart.