Komatsu PC20R-8 Shop Manual page 289

No. Check item
Clearance between
1
piston and cylinder
Clearance between
2
shoe and piston
Travel increment
3
piston spring
4 Braking valve return spring
Travel increment
5
spool return spring
PC20R-8 PC27R-8
53.7w5 Nm
Standard clearance
0.01 ± 0.02
0.03 ± 0.15
Standard size
Free
length
15.7
29
36
5
Section B ± B
Sezione B - B
Criteria
Installed Installed
length load
7 7.8 N
24.7 60 N
29.5 68 N
53.7w5 Nm
RKP01391
Clearance limit
0.4
0.4
Repair limit
Free Installed
length load
13.9 6.3 N
28.1 48 N
34.7 54 N
Unit: mm
Remedy
Replace
When
damage or
deformation
is found,
replace the
spring
40-25