Sakai SW800 Series, Shop Manual

Page: 149 / 159

4-406
Does propulsion
main circuit pres-
sure increase with
F-R lever operat-
ed?
9
11
Is fault rectified if
cut off valve is dis-
assembled and
cleaned?
8
YES
YES
NO
YES
NO
NO
YES
Are metal particles
noticeable in oil
drained from front
motor reduction
gear?
10 YES
NO
Are metal particles
noticeable in oil
drained from rear
motor reduction
gear?
12
Does charge pressure
return to normal with
front motor ports (A,
B) blocked (unloader
valve opened)?
YES
NO
13
A
B
Possible cause
Remedy
Front wheel drive motor
reduction gear damaged.
Front drive motor damaged.
Rear drive motor reduction
gear damaged.
Rear drive motor damaged.
Is fault rectified if
high pressure relief
valve is disassem-
bled and cleaned?
Cut off valve faulty.
Clean and adjust.
Renew if
necessary.
High pressure relief valve
faulty.
To ‘B’ on this page
Leakage at sliding portions
(such as piston) of front motor.
Leakage at sliding portions
(such as piston) of rear motor.
NO
Repair. Renew
as necessary.
Repair. Renew
as necessary.
Repair. Renew
as necessary.
Repair. Renew
as necessary.
Clean and adjust.
Renew if
necessary.
Repair. Renew
as necessary.
Repair. Renew
as necessary.
* Due to difficulty in deciding checking
sequence, a ‘YES’ line on this page carries
two checking items.
• Generally, checking items with smaller refer-
ence number have higher probability.
Fault Finding for Hydraulic and Mechanical Systems
a) Not propelled in both directions (forward and backward).
(2/2)