Komatsu PC88MR-10 Shop Manual page 1282

60 Maintenance standard
Control valve
No. Item
Tightening torque of nut
1
Tightening torque of nut
2
Piston return spring
3
Suction valve spring
4
Spool return spring
5
Spool return spring
6
Spool return spring
7
Spool return spring
8
Spool return spring
9
10 Spool return spring
11 Spool return spring
12 Spool return spring
13 Spool return spring
60-30
Procedure:
1. 19.6 to 29.4 Nm {2 to 3 kgm}
2. 39.2 to 44.0 Nm {4 to 5 kgm}
3. 58.8 to 73.5 Nm {6 to 7.5 kgm}
Procedure:
1. 9.8 to 14.7 Nm {1 to 1.5 kgm}
2. 19.2 to 29.5 Nm {2 to 2.5 kgm}
3. 29.4 to 34.3 Nm {3 to 3.5 kgm}
Standard dimension
Free
Installed
height x
height
outside
diameter
29 x 18.3 28.5
29 x 18.4 28.5
29 x 17.5 28.5
41.5 x 19.3 28.5
41.1 x 19.3 40.5
42.3 x 19.2 40.5
41.5 x 19.3 40.5
42.3 x 19.2 40.5
42.3 x 19.2 40.5
41.1 x 19.3 40.5
41.3 x 15 33.5
Criteria
Repair limit
Load at
Free
installed
height
height
30.4 N
{3.1 kg}
30.4 N
{3.1 kg}
22.6 N
{2.3 kg}
27.1 N
{2.76 kg}
44.2 N
{4.51 kg}
34.7 N
{3.5 kg}
44.2 N
{4.51 kg}
54.6 N
{5.6 kg}
54.6 N
{5.6 kg}
32.8 N
{3.34 kg}
183.7 N
{18.7 kg}
Unit: mm
Remedy
Adjust
Load at
installed
height
28.6 N
{2.9 kg}
28.6 N
{2.9 kg}
21.2 N
{2.16 kg}
25.4 N
{2.59 kg}
Replace
41.5 N
spring if
damaged or
{4.2 kg}
deformed
32.2 N
{3.29 kg}
41.5 N
{4.2 kg}
51.6 N
{5.26 kg}
51.6 N
{5.26 kg}
30.8 N
{3.1 kg}
172.5 N
{17.5 kg}
PC88MR-10