Sakai SW800 Series, Shop Manual

Page: 152 / 159

4-409
Fault Finding for Hydraulic and Mechanical Systems
NO
15
YES
Does charge pres-
sure return to nor-
mal with brake
valve inlet hose
blocked?
*1
6
Is propulsion main
circuit pressure (re-
lief pressure) as
specified?
Possible cause
Remedy
To ‘A’ on page 4-410.
Rear motor flushing valve
faulty.
Charge relief valve faulty.
Leakage at sliding portions
(such as piston) of rear motor.
Steering pump faulty. Renew.
Inner leakage of motor brake
cylinder
*See Standard Value
Chart.
NO
YES 14
Does charge pressure
return to normal with
motor ports A and B
blocked (unloader
valve opened)?
Clean and adjust.
Renew if
necessary.
Repair. Renew
if necessary.
Leakage at sliding portions
(such as piston) of front
motor.
Repair. Renew
if necessary.
Pump servo valve or servo
linkage faulty.
F-R lever linkage faulty.
Set lever
correctly.
Unloader valve lever position
incorrect.
*1 Recheck the item enclosed by a dotted line.
*2 Due to difficulty in deciding checking
sequence, a ‘NO’ line on this page carries
two checking items.
• Generally, checking items with smaller refer-
ence number have higher probability.
To ‘B’ on page 4-410.
Clean and adjust.
Renew if
necessary.
Repair. Renew
if necessary.
Leakage at sliding portions
(piston) of propulsion pump or
vibrator pump.
Repair. Renew
if necessary.
Repair. Renew
if necessary.
Repair. Renew
if necessary.