Komatsu PC88MR-10 Shop Manual page 1189

Nut (4):
Cylinder name
Boom
Arm
Bucket
Blade
Swing
a Tighten the nut as directing its machined
surface toward the piston.
4. Cylinder assembly
1) Set cylinder (5) on tool U1.
2) Install piston rod assembly (3).
a Fully push the piston rod.
3) Tighten head assembly (2) by using a
hydraulic pump or a torque multiplier wrench
with tool U2.
PC88MR-10
Tightening torque
3.33 ± 0.33 kNm {340 ± 34
kgm}
2.65 ± 0.26 kNm {270 ± 27
kgm}
2.16 ± 0.22 kNm {220 ± 22
kgm}
3.14 ± 0.31 kNm {320 ±
32.0 kgm}
2.6 ± 0.26 kNm {265 ± 26.5
kgm}
50 Disassembly and assembly
Head assembly (2):
Cylinder name
Boom 961 ± 96.1 Nm {98 ± 9.8
Arm 785 ± 78.5 Nm {80 ± 8.0
Bucket 1st: Tighten to 1,176 to
1.372 kNm {120 to 140
2nd: Tighten up to 0 kNm
3rd: Tighten up to 392 Nm
4th: Angle tighten the
(Rotation amount: 3.5 to
Blade 1.03 ± 0.10 kNm {105 ±
a After assembly, clean each part, and
perform masking of piping ports and pin
insertion parts.
Hydraulic system
Tightening torque
kgm}
kgm}
kgm}.
{0 kgm}
{40 kgm}
cylinder head
4.5 mm)
10.5 kgm}
50-161