JLG 4017PS Service Manual - Manual (Page 52)

Boom
3-14 3706PS, 3707PS, 4014PS, 4017PS, 33.7, 37.6, 37.7
4. At the rear of the boom, loosen and remove all
retract chain sheave components (9).
5. Remove the retaining rings and pin from the extend/
retract cylinder at the rear of the second boom
section (10).
6. Secure the hydraulic hoses at the rear of the third
boom section.
7. Place a sling around the third boom section, lift and
slowly pull the third boom section approximately half
way out of the second boom section. Lower the third
boom section onto a suitable support.
8. Relocate the sling or using two slings for better
stability, balance the third boom section and slowly
pull the third boom section out of the second boom
section. Lower the third boom section onto suitable
supports.
9. Loosen and remove the tilt circuit, auxiliary circuit
hoses from the rear of the third boom section.
10. Remove the retaining rings and pin from the extend/
retract cylinder at the front of the third boom section
(11).
11. Place a sling around the rear of the extend/retract
cylinder, lift and slowly pull the extend/retract
cylinder approximately half way out of the third boom
section. Lower the extend/retract cylinder onto a
suitable support.
12. Relocate the sling or using two slings for better
stability, balance the extend/retract cylinder and
slowly pull the extend/retract cylinder out of the third
boom section. Lower the extend/retract cylinder onto
suitable supports.
3.6.4 Third Boom Section and Extend/
Retract Cylinder Installation
Note: During reassembly use Loctite ® 242 TM on all bolt
threads and use Loctite 545 ® on all hydraulic fittings
Note: Shim all wear pads. Refer to Section 3.17, “Boom
Wear Pads.” You may have to final adjust the wear pads
after the boom assembly is installed on the machine and
hydraulic power is available.
Note: Coat the interior of all bushings and sheaves with
Mystik Tetrimoly Grease XD#2 prior to the installation of
pins and bushings. Wear pads and slide areas must be
lubricated with Mystik Tetrimoly Grease XD#2 or an
equivalent.
1. Place the third boom section upside down on
suitable supports.
2. Place a sling around the extend/retract cylinder and
slowly insert the extend/retract cylinder halfway into
the rear of the third boom section. Lower the extend/
retract cylinder onto a suitable support.
3. Relocate the sling and install the extend/retract
cylinder the remainder of way into the third boom
section.
4. Align the rod end of the extend/retract cylinder with
the bore in the front of the third boom section and
install the pin and retaining rings (1).
5. Install the extend/retract hoses to the barrel end of
the extend/retract cylinder.
MAM0730 9
10
MAM0870
11
MAM0870
1