JLG sky trak mmv Service Manual page 169

Note: ALWAYS use new o-rings when servicing the
vehicle.
19. Install new o-rings into the fittings. Lubricate o-rings
with clean hydraulic oil.
16
16
16
16
20. Remove the plugs and caps from the hoses and
fittings and connect the extend (19), retract (20),
attachment tilt (21) and fork side shift hydraulic (22)
hoses to the boom tubes.
Model MMV Rev. 12/04
9
11
10
8
18
17
13
12
15
14
16
16
14
MM3980
22
19
23
MM4000
Note: ALWAYS replace elastic locknuts with new elastic
locknuts to help ensure proper fastening.
21. Install retract chain (23) at the front (24) of the outer
boom. Use a 3/4" flat washer and a new 3/4-16
elastic locknut.
22. Install the intermediate boom. (Refer to Section
4.3.4, Intermediate Boom Replacement .)
23. Install the inner boom, extend/retract cylinder and
extend chain and attaching hardware. (Refer to
Section 4.3.2, Inner Boom Replacement .)
24. Clean up all debris, hydraulic fluid, etc., in, on, near,
and around the vehicle.
WARNING:
operation in closed areas without adequate
ventilation. Failure to properly ventilate
exhaust fumes can result in death or serious
personal injury.
25. Start the engine and operate all boom functions
several times. Check the chain tension again and
adjust as necessary (refer to Section 4.3.6, Boom
Chains ). Check for leaks, and check the hydraulic
fluid level in the tank; add fluid if required.
26. Apply grease at all lubrication points (grease fittings).
(Refer to Section 4.3.8, Boom Lubrication Points .)
Boom
24
21
20
MM3990
Avoid prolonged engine
4.25