Komatsu 830E, Shop Manual

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N2-2 Truck Cab 04/03 N02014
Prior to cab removal or repair procedures, it may be
necessary to remove the body to provide clearance
for lifting equipment to be used. If body removal is
not required, the body should be raised and the
safety cables installed at the rear of the truck.
Do not attempt to work in deck area until body
safety cables have been installed.
Removal
NOTE: The following procedure describes removal of
the cab as a complete module with the hydraulic
brake cabinet attached. All hoses and wire
harnesses should be marked prior to removal for
identification to ensure correct reinstallation:
1. Turn the key switch to the "Off" position and
allow at least 90 seconds to bleed the steering
accumulator. Turn the steering wheel to be sure
no pressure remains. If installed, open the
automatic/manual drain valve mounted below
the air tank and drain air supply.
2. Block truck securely, and open the brake accu-
mulator bleed down valves on the accumulators
located in the cabinet mounted on the rear of
the cab. Allow sufficient time for accumulators
to bleed down completely.
3. Open the battery disconnect switch located at
the left hand ladder.
4. Disconnect hydraulic hoses routed to frame from
fittings at rear of cab under brake cabinet (3,
Figure 2-2). (It is not necessary to disconnect
hoses (2) attached to, and routed under the
cab.) Cap all fittings and plug hoses to prevent
contamination.
5. Disconnect wire harnesses at connectors (5)
located under hydraulic cabinet.
6. Remove cable and hose clamps as needed for
cab removal
7. Close heater shutoff valves located at the water
pump inlet housing on the right side of the
engine and at the water manifold. Disconnect
heater hoses at each valve and drain coolant
into a container.
8. Remove clamps and heater hoses from fittings
underside of deck, below heater.
Federal regulations prohibit venting air condi-
tioning system refrigerants into the atmosphere.
An approved recovery/recycle station must be
used to remove the refrigerant from the air condi-
tioning system.
9. If the truck is equipped with air conditioning,
evacuate the air conditioning system:
a. Attach a recycle/recovery station at the air
conditioning compressor service valves.
(Refer to "Heater/Air Conditioning System" in
Section "M" for detailed instructions.)
b. Evacuate air conditioning system refrigerant.
c. Remove the air conditioner system hoses
routed to the cab from the receiver/drier and
compressor. Cap hoses and fittings to pre-
vent contamination.
10. Attach a lifting device to the lifting eyes provided
on top of the cab.
The cab assembly weighs approximately 5000
lbs. (2270 kg). Be sure lifting device is capable of
lifting the load.
11. Remove the capscrews and washers from each
mounting pad (1, Figure 2-1) at the corners of
the cab.
NOTE: The tool group shipped with the truck
contains the following tools which may be used to
remove the inner capscrews, as clearance is limited:
• PB8326 - 1-1/2" offset wrench
• TZ2733 - Tubular Handle
• TZ2734 - 3/4" torque wrench Adaptor
12. Check for any other hoses or wiring which may
interfere with cab removal.
13. Lift the cab assembly off the truck and move to
an area for further service.
14. Place blocking under each corner of the cab to
prevent damage to floor pan and hoses before
cab is lowered to the floor.