JLG 4017PS Service Manual - Manual (Page 46)

Boom
3-8 3706PS, 3707PS, 4014PS, 4017PS, 33.7, 37.6, 37.7
3.3.6 Extend/Retract Cylinder Installation
Note: Grease the boom extend/retract cylinder bore and
pins before installing.
1. Place the sling at the balance point around the
extend/retract cylinder barrel (2).
2. Install the extend/retract cylinder halfway into the
rear of the second boom section.
3. Lower the extend/retract cylinder onto a suitable
stand and reposition the sling toward the end of the
cylinder.
4. Lift and push the extend/retract cylinder the
remainder of the way into the boom section.
5. Align the barrel end of the extend/retract cylinder
with the pin bores in the second boom section.
6. Install the extend/retract cylinder mounting pin (3).
7. Install the retaining rings (1) into the pin bores
making sure the rings seat properly within the bore
grooves.
3.3.7 First Boom Section Installation
Note: Light lubrication of the boom wear surfaces with a
factory authorized grease is recommended to keep the
boom wear surfaces lubricated properly. 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, place the
transmission control lever in (N) NEUTRAL, engage
the park brake and shut the engine OFF.
2. Place a Do Not Operate Tag on both the ignition key
switch and the steering wheel.
3. Open the engine cover. Allow the system fluids to
cool.
Note: Grease the boom pivot bore, compensating
cylinder rod ends, lift/lower cylinder rod end and pins
before installing.
4. Using suitable slings, balance the first boom section,
lift and carefully guide the boom into place. Align the
frame pivot bore with the boom assembly pivot bore.
Install boom pivot pin and lock bolt (4). Apply
Loctite
® 242 TM and torque to 90 Nm (66 lb-ft).
MAM0660
3
1
1
2
MAM0670
4