Ppc Valve (For Boom, Arm, Bucket, Swing) - Komatsu PC20R-8 Shop Manual

PPC VALVE
FOR BOOM, ARM, BUCKET, SWING
1
3
Section A ± A
Sezione A - A
2
3
Section C ± C
Sezione C - C
No. Check item
Centering spring
1
(P3 and P4 port)
Centering spring
2
(P1 and P2 port)
3 Metering spring
40-26
112.8w14.7 Nm
(11.5w1.6 kgm)
44.1w4.9 Nm
(4.5w0.5 kgm)
6.37w2.45 Nm
(0.65w0.25 kgm)
Standard size
Free length Installed
x é.D. length
38.7x15.5 34
42.5x15.5 34
26.5x9.2 24.9
Section B ± B
Sezione B - B
Section D ± D
Sezione D - D
Section E ± E
Sezione E - E
Criteria
Repair limit
Installed Free
load length
9.8 N
Ð
(1.0 kg)
17.7 N
Ð
(1.8 kg)
16.7 N
Ð
(1.7 kg)
13.2w1.5 Nm
(1.35w0.15 kgm)
8.33w2.45 Nm
(0.85w0.25 kgm)
RKP01330
Unit: mm
Remedy
Installed
load
When
damage or
7.8 N
deformation
(0.8 kg)
is found,
replace the
14.1 N
spring
(1.44 kg)
13.7 N
(1.4 kg)
PC20R-8 PC27R-8