JLG 266 LoPro Service Manual - Manual (Page 27)

3.5 266, 307, 266 LoPro
Boom
6. Pull the second boom section out 15 cm to 20 cm
(6 in to 8 in) to be able to loosen and remove all the
bolts and remove all the wear pads, backing plates
and shims from the front inside of the first section
boom. Tag each pad, backing plate, shim and bolts
from each location.
7. Remove the clip and pin from the rod end of the
extend/retract cylinder and pull through the rear of
the second boom section.
8. Pull out the remainder of the second boom section.
9. Inspect the boom and welds. Consult your local JLG
distributor if structural damage is detected.
10. Inspect hoses, hardware, wear pads, mounting
points and other components visible with the first
boom section. Replace any item if damaged.
11. Inspect all wear pads for wear. (Refer to Section
3.4.1, “Wear Pad Inspection.”)
3.3.3 Second Section Boom Installation
1. Insert the extend/retract cylinder through the rear of
the second boom section and attach the pin and clip
to the rod end.
2. Install the bottom rear wear pads, washers and bolts
into the first boom section. Apply Loctite ® #242 and
torque to 90 Nm (66 lb-ft). Install the bottom rear left
and right side wear pads, backing plate and bolts (do
not shim or tighten bolts). Install top rear wear pads,
backing plates and bolts (front bolts are drilled and
tapped for zerk fittings, do not shim or tighten bolts).
3. Grease the inside of the first boom section on areas
where the second boom section wear pads will slide.
4. Using a suitable sling, carefully slide the second
boom section 1 m to 1.5 m (3 ft to 4 ft) into the front
of the first boom section. Set the second boom
section head onto suitable supports and reset sling
under the boom head of the second section.
Carefully slide the second section into the first
section. Leave 15 cm to 20 cm (6 in to 8 in) of the
second section out to be able to install wear pads in
front of the first boom section.
5. With the sling still under the boom head, install the
top wear pads, washers and bolts in the front of the
first boom section. Apply Loctite
® #242 and torque
to 90 Nm (66 lb-ft). Lower the second boom section
and install the bottom wear pads, backing plates,
shims and bolts in the front of the first boom section.
Apply Loctite
® #242 and torque to 90 Nm (66 lb-ft).
Install both left and right side front wear pads,
backing plates, shims and bolts in the front of the
first boom section. Apply Loctite
® #242 and torque
to 90 Nm (66 lb-ft).
IMPORTANT: Light lubrication of the boom wear
surfaces with a factory authorized grease is
recommended to keep the boom wear surfaces
lubricated properly.
6. Tighten all rear wear pad bolts after ensuring the
minimum gap requirements have been met. Refer to
Section 3.4.1, “Wear Pad Inspection.”
7. Insert the pin and clip into the barrel end of the
extend/retract cylinder.
8. Lift the tilt cylinder into place and insert the pins and
clips to secure the cylinder to the boomhead.
9. Slide the tilt and auxiliary hoses between the boom
sections.
10. Uncap and reconnect the tilt and auxiliary hoses and
attach to their appropriate locations.
3.3.4 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, 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, stating that the
machine should not be operated.
3. Open the engine cover. Allow the system fluids to
cool.
4. Using suitable slings, turn boom back over to original
orientation.
Note: Grease the boom pivot bore, compensating
cylinder rod ends, lift/lower cylinder rod end and pins
before installing.
5. 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 (1) and lock bolt. Apply
Loctite
® #242 and torque to 90 Nm (66 lb-ft).
WARNING:
NEVER weld or drill the
boom. The structural integrity of the boom will
be impaired if subjected to any repair involving
welding or drilling. Failure to comply can result
in death or severe personal injury.