JLG 4017 Service Manual - Manual (Page 37)

3.13 4017
Boom
3.3.10 Boom Installation
IMPORTANT: Light lubrication of the boom wear
surfaces with a factory authorized grease is
recommended to keep the boom wear surfaces
lubricated properly. Light lubrication of the boom wear
surfaces is also recommended when the machine is
stored, to help prevent rusting.
1. Park the machine on a hard, level surface. Make
sure park brake is set, key is removed from the
ignition and “DO NOT OPERATE” tag is placed in
clear view in the cab.
2. Using suitable slings, balance the boom assembly,
lift and carefully guide the boom into place. Align the
frame pivot bore with the boom assembly pivot bore.
Install boom pivot pin (6). Apply Loctite 242
® and
torque lock bolt to 90 Nm (66 lb-ft).
3. With the sling still in place, install both compensation
cylinders, pins and lock bolts (7). Apply Loctite 242 ®
and torque to 90 Nm (66 lb-ft).
4. With the sling still in place, install the rod end of the
lift/lower cylinder, pin and lock bolt (8). Apply Loctite
242
® and torque to 90 Nm (66 lb-ft).
Note: Raising the boom up or down with the sling
maybe necessary so the boom, compensation and lift/
lower cylinder bores can be aligned for easier pin
installation.
Note: Grease the boom pivot bore, compensation
cylinder rod ends, lift/lower cylinder rod end and pins
before installing.
5. Remove the caps from extend/retract cylinder fittings
and plugs from extend/retract cylinder hoses. Attach
each hose to the extend/retract cylinder fittings (9)
and tighten until wrench-tight. Mark the hose fitting
then tighten each hose firmly 1 to 1 1/2 flats.
6. Remove the caps from both tilt tubes (10) and
auxiliary tubes (11) and plugs from both tilt hoses
and both auxiliary hoses. Attach both sets of hoses
to the tilt tubes and the auxiliary tubes and tighten
until wrench-tight. Mark the hose fitting then tighten
each hose firmly 1 to 1 1/2 flats.
7. Connect the boom angle indicator rod from switch at
the inside left rear corner of the main boom section
and frame. Refer to Section 9.11.9, “Boom Angle
Sensor,” for adjustment information.
8. Start the engine and operate all boom functions
several times. Check for leaks, and check the
hydraulic fluid level in the reservoir; add fluid if
required.
9. Clean up all debris, hydraulic fluid, etc., in, on, near
and around the machine.
MZ1230
6
7
7
MZ1240 8 MZ1250
9
11
10