Removal; Revolving Frame - Komatsu PC20R-8 Shop Manual

REMOVAL AND INSTALLATION
REMOVAL OF REVOLVING FRAME
Fully extend the arm and open completely the buck-
et, lower the equipment until it rests on the ground;
stop the engine.
Release all residual pressures from all circuits and
from the tank. (For details, see «20. CONTROLS
AND ADJUSTMENTS»).
H Drain the hydraulic oil and the fuel.
Hydraulic oil: approx. 29
Fuel: max. 35
1 - Remove the work equipment.
(For details, see «REMOVAL OF THE WORK EQUIP-
MENT»).
2 - Removal the boom cylinder. (For details, see «RE-
MOVAL OF BOOM CYLINDER»).
3 - Remove the side lower panels.
(For details, see «REMOVAL OF THE SIDE LOWER
PANELS»).
4 - Remove the accumulator (1).
H Disconnect first the negative terminal (±) and then
the positive terminal (+).
5 - Remove the rear counterweight. (For details, see
«REMOVAL OF THE REAR COUNTERWEIGHT»).
6 - Remove the platform. (For details, see «REMOVAL
OF THE PLATFORM»).
7 - Disconnect the swing circle lubrication tube (2) and
remove the coupling (3).
8 - Remove the swing machinery (4). (For details, see
«REMOVAL OF SWING MACHINERY»).
9 - Disconnect the upper tubes (5) (N
joint.
H Mark the tubes to avoid exchanging them during
re-assembly.
10 - Remove the bracket (6) of the joint.
11 - Loosen and remove the screws (7) that secure the re-
volving frame.
H Leave two opposite screws in position for safety.
12 - Attach the revolving frame (8) to some hoisting tackle
and apply a slight tension to the cables.
H Adjust the length of the cables to balance the
group.
13 - Loosen and remove the two turret screws (7) left in
position for safety.
14 - Remove the revolving frame (8).
Revolving frame: PC20R-8: 1000 kg
30-46
,
,
. 8) from the swivel
o
PC27R-8: 1400 kg

REVOLVING FRAME

1
6
5
4
8
RKPA3410
2
3
7
RKPA3420
RKPA3430
PC20R-8 PC27R-8