Sakai SW880-1, Shop Manual

Page: 188 / 428

10-004
INSPECTION AND ADJUSTMENT
2-2-2. If pressure on either the forward or reverse
side deviates from maximum circuit
pressure range
①
Check nut (5) of high pressure relief valve (1-11) or (1-14)
for evidence of having loosened.
High pressure relief valve (1-11): Forward side
High pressure relief valve (1-14): Reverse side
②
If there is evidence of nut having loosened, adjust high
pressure relief valve so that pressure becomes within
maximum circuit pressure range while watching pressure
gauge.
To adjust pressure, loosen nut and turn adjustment screw
(6).
Adjustment screw turned clockwise
: Pressure rise
Adjustment screw turned counterclockwise
: Pressure drop
Pressure change rate : 20 MPa/turn (2,900 psi/turn)
③
If there is no evidence of nut having loosened, remove
high pressure relief valve.
④
Check removed high pressure relief valve for trapped dirt
and scratches on its seat.
⑤
If trapped dirt is present, disassemble and clean high
pressure relief valve.
⑥
If a scratch is found on seat, replace high pressure relief
valve.
⑦
After adjustment, measure pressure again and check that
pressure reaches maximum circuit pressure range.
(5) Nut : 20 N·m (15 lbf·ft)
(1-11) High pressure relief valve
(1-14) : 150 N·m (111 lbf·ft)
(NOTICE)
Carefully disassemble and reassemble after taking
steps to prevent foreign material from getting in.
The numbers such as “1-11” and “1-14” appearing in above illustrations are consistent with lead line numbers
shown in illustration of propulsion pump in “2-2. Hydraulic Component Specifications” (page 4-006).
•
•
•
•
•
SW880-10003
1-11
1-14
Propulsion pump
SW880-10003
1-11
1-14
Propulsion pump
SW880-10006
6
5
High pressure relief valve
SW880-10006
6
5
High pressure relief valve