Sakai SW880-1, Shop Manual

Page: 195 / 428

10-011
INSPECTION AND ADJUSTMENT
6-2-2. Inspection of high pressure relief valves
(port relief valves) installed in vibrator
valve blocks in vibrator circuit
①
Check nut (10) of high pressure relief valve (6), (7), (8) or
(9) for evidence of having loosened.
High pressure relief valve (7)
: Front drum low amplitude side
High pressure relief valve (6)
: Front drum high amplitude side
High pressure relief valve (9)
: Rear drum low amplitude side
High pressure relief valve (8)
: Rear drum high amplitude 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.
Before adjusting pressure, energize solenoid valve
installed in vibrator valve block to have it function as a
port relief valve.
To adjust pressure, loosen nut and turn adjustment screw
(11).
Adjustment screw turned clockwise
: Pressure rise
Adjustment screw turned counterclockwise
: Pressure drop
Pressure change rate : 14 MPa/turn
(2,030 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.
(1) Nut : 13.5
± 1.5
N·m (10
± 1.1
lbf·ft)
(6) to (9) High pressure relief valve
: 44
± 3
N·m (32
± 2.2
lbf·ft)
(NOTICE)
Carefully disassemble and reassemble after taking
steps to prevent foreign material from getting in.
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SW880-1-10009
6 7 8 9
Vibrator valve block (F) Vibrator valve block (R)
SW880-10013
11
10
High pressure relief valve