JLG 4017PS Service Manual - Manual (Page 57)

3-19 3706PS, 3707PS, 4014PS, 4017PS, 33.7, 37.6, 37.7
Boom
3.7.4 Extend Chain Installation
1. Fasten the rope/wire left in the boom from the
extend chain removal to the new extend chain and
pull the chain through the boom sections to the
approximate final position. Remove the rope/wire.
2. Install the extend chain lock nut and adjusting nut (5)
at the top of the first boom section.
3. Install the extend chain connecting pin (7) at the rear
of the third boom section.
4. Repeat steps 1 through 3 to install the other extend
chain.
5. Install the hose guard bracket (6).
6. Properly connect the battery.
7. Close and secure the engine cover.
8. For chain adjustments see Section 3.10.1, “Chain
Adjustments.”
3.8 EXTEND/RETRACT, TILT AND
AUXILIARY CIRCUIT HOSE
REMOVAL/INSTALLATION
Hoses that need replaced and are still in one piece can
be removed and replaced without removing sections of
the boom.
3.8.1 Extend/Retract Hose Removal
1. Remove any attachment from the quick coupler
assembly. Refer to Operation & Safety Manual.
2. Park the machine on a hard, level surface, fully
retract the boom, level the boom assembly, place the
transmission control lever in (N) NEUTRAL, engage
the park brake and shut the engine OFF.
3. Place a Do Not Operate Tag on both the ignition key
switch and the steering wheel.
4. Open the engine cover. Allow the system fluids to
cool.
5. Properly disconnect the battery.
6. Label, disconnect and cap both hoses from the
extend/retract cylinder at the rear of the boom. Cap
all fittings and openings to keep dirt and debris from
entering the hydraulic system.
7. Fasten a rope/wire to the hose end below the first
boom section.
8. From the rear of the boom, pull the extend/retract
hoses from between the first and second boom
sections.
9. Unfasten the rope/wire from the hose end.
Note: Always check hose sheaves for wear and/or
damage. Replace if necessary.
3.8.2 Extend/Retract Hose Installation
1. Fasten the rope/wire left in the boom from the hose
removal to the new hose end at the rear of boom.
2. Slowly pull the rope/wire from below the first boom
section until the hose end is visible at the tube
connections.
3. Unfasten the rope/wire from the extend/retract hose.
4. Uncap and connect the hoses to the previously
labeled tubes under the first boom section.
5. Uncap and connect the hoses to the previously
labeled fittings at the rear of the extend/retract
cylinder. Refer to Section 2.3.3, “Hydraulic Hose
Torque Chart,” for proper hose torque.
3.8.3 Tilt/Auxiliary Hose Removal
1. Label, disconnect and cap both hoses from the tilt
cylinder or auxiliary fittings at the front of the boom.
Cap all fittings and openings to keep dirt and debris
from entering the hydraulic system.
2. Fasten a rope/wire to the hose end at the boom
head.
3. Label, disconnect and cap both hoses attached to
the tubes on the bottom of the boom. Cap all fittings
and openings to keep dirt and debris from entering
the hydraulic system.
4. Fasten a rope/wire to the hose end below the first
boom section.
5. Loosen and remove the clamps holding the tilt hoses
at the rear of the third boom section.
6. From the rear of the boom, pull the tilt hoses from
between the first and second boom sections.
7. Unfasten the rope/wire from each end of the hose
assembly.
Note: Always check hose sheaves for wear and/or
damage. Replace if necessary.