JLG 723A Service Manual - Manual (Page 53)

4-9 L2906H, 2906H, 3507H, 619A, 723A, 29.6LP, 29.6, 35.7
Cab and Covers
3. Open the engine cover. Allow the system fluids to
cool.
4. Properly disconnect the battery.
5. If equipped with a cab heater, Refer to Section
4.4.10, b. “Heater Assembly Installation.”
6. Working underneath the cab, label, disconnect and
cap all hydraulic hoses at the cab fittings. Cap all
fittings and openings to keep dirt and debris from
entering the hydraulic system.
7. In the cab, disconnect the throttle cable at the
throttle lever bracket. Route the cable away from the
cab to prevent damage during removal.
8. Label and disconnect the cab harness connectors.
Move the harnesses clear of the cab to prevent
damage during cab removal.
9. Install two lifting eye bolts with a minimal lifting
capacity of 363 kg (800 lb) in the existing holes at
the top of the cab (1).
10. Use a hoist or overhead crane and sling with a
minimal lifting capacity of 363 kg (800 lb) attached to
the four lifting eye bolts. DO NOT attempt to lift the
cab at this point.
11. Remove the bolts (2), washers and nuts securing the
cab to the frame.
12. Remove the mirrors and all other cab components
as needed, if not previously removed.
13. When all wiring, hydraulic hoses and fasteners are
disconnected or removed, carefully and slowly lift
the cab and remove it from the frame. Readjust the
position of the sling as needed to help balance the
cab during removal.
14. When the cab is completely clear of the machine,
carefully lower it to the ground. Block up or support
the cab so that it does not move or fall. Assure that
no personnel enter the cab while it is being removed
from the machine.
15. Inspect the condition of the fittings, clamps,
hydraulic hoses, etc. Replace parts as indicated by
their condition.
16. Inspect and replace other machine parts that are
exposed with the cab removed. Repair or replace as
required.
4.6 CAB INSTALLATION
1. Block all four wheels to help prevent the machine
from moving. Assure that there is sufficient overhead
and side clearance for cab installation.
2. Attach a sling with minimal lifting capacity of 363 kg
(800 lb) through the previously installed eye bolts.
3. Use a hoist or overhead crane and sling attached to
the cab. Carefully begin to align the cab with the
mounting holes in the frame. Stop and check that
wiring, hydraulic hoses, cables, etc., will not be
pinched or damaged as the cab is positioned. Take
special note of the fuel fill tube as well. Readjust the
position of the sling as needed to help balance the
cab during installation.
4. Install the cab-to-frame bolts, washers and nuts (2).
Torque the upper cab bolts to 461 Nm (340 lb-ft).
Torque the lower cab bolts to 719 Nm (530 lb-ft).
5. Remove the eye bolts from the top of the cab (1).
6. Connect the throttle cable to the throttle bracket in
the cab.
7. Uncap and reconnect the hydraulic hoses at the cab
locations.
8. Secure the throttle cable to the hydraulic hoses
using nylon ties.
9. Install the cab-to-wiring harness connectors on side
of the cab.
10. Uncap and connect the heater hoses to the engine.
Secure with hose clamps.
11. If equipped with a cab heater, Refer to Section
4.4.10, “Heater/Air Conditioning System (If
Equipped).”
12. Properly connect the battery.
MZ5400
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