JLG 4017PS Service Manual - Manual (Page 64)

Boom
3-26 3706PS, 3707PS, 4014PS, 4017PS, 33.7, 37.6, 37.7
3.13.4 Fourth Boom Section Removal
1. With the two boom sections setting on suitable
supports remove the bolts, keeper and pin from
sheave on the front of the third boom section.
Remove the sheaves. Remove all wear pads, from
the front inside of the third boom section. Label all
parts for installation.
2. Remove the top left and right side rear wear pads on
the fourth boom section. Loosen the bottom rear
wear pad bolts and remove the shims from the fourth
boom section to gain the necessary clearance to be
able to remove the fourth boom section from the
third boom section. Label all parts for installation.
3. Loosen and remove the two bolts holding the rear of
the hose carrier to the top of the third boom section.
Lift and push rear of hose carrier into the fourth
boom section.
4. Place a sling around the front of the fourth boom
section (4). Lift and slide the fourth boom section 3/4
of the way out of the third boom section. Set the
boom head down on a suitable support, then center
the sling to be able to balance the fourth boom
section being removed. Carefully pull the fourth
boom section the remainder of the way out of the
third boom section and set the fourth boom section
down on suitable supports.
5. Remove the clip and pin holding both extend chains
from bottom of third and fourth boom sections. Clean
and inspect chains. Replace if damaged.
6. Inspect the boom and welds. Consult your local
authorized service distributor if structural damage is
detected.
7. Inspect hoses, hardware, wear pads, mounting
points, chains and other components visible with the
first boom section. Replace any item if damaged.
(Refer to Section 3.16, “Boom Extend and Retract
Chains - 4014PS & 4017PS,” and Section 3.17.1,
“Wear Pad Inspection.”)
8. It is recommended that if any chain or hose is
damaged that ALL chains or hoses are replaced.
3.13.5 Hose Carrier Removal
1. Label, disconnect and cap both auxiliary hydraulic
hoses in the boom head. Cap all fittings to prevent
dirt and debris from entering hydraulic system.
2. With fourth boom section setting on suitable
supports loosen and remove the six bolts (three per
side) on the fourth boom section.
3. Pull the hose carrier (5) halfway out of fourth boom
section by hand and set on a suitable support. Place
a sling around the center of the hose carrier to be
able to balance the hose carrier while being
removed. Carefully slide the hose carrier the
remainder of the way out of the fourth boom section
and set down on suitable supports.
3.13.6 Hose Carrier Installation
1. Install the hose carrier into the fourth boom section.
Using a suitable sling, place the sling under the
center of the hose carrier and guide the front of hose
carrier into the rear of the fourth boom section. Set
the rear of the hose carrier on a suitable support.
Remove the sling and slide the remainder of the
hose carrier into the fourth boom section by hand.
2. Apply Loctite ® 242 TM to the hose carrier bolts. Install
the bolts through the three holes on each side of the
fourth boom section. Install the front two bolts first.
Install the middle two next. Then the rear two bolts
last. Torque to all six bolts to 90 Nm (66 lb-ft).
MZ5710
4
MZ5720
5