JLG 3969electric Service Manual - Manual (Page 23)

SECTION 2 - PROCEDURES
3120881 – JLG Sizzor – 2-11
2.13 STEER CYLINDER DISASSEMBLY AND
ASSEMBLY
Disassembly
1. Remove cylinder retainer caps on both ends by turn-
ing clockwise with a strap wrench to loosen
2. Remove heads of both ends by pushing on rod in
both directions and sliding off of rod.
3. Remove rod from barrel carefully so as not to dam-
age inner surface of barrel.
4. Remove spacer tubes by sliding towards both ends
of the rod.
5. Remove piston from rod by removing retaining rings
and sliding off the rod.
Inspection
1. Inspect the head wiper, rod seal, o-ring, and wear
ring for wear, scratches, and damage. Clean or
replace both heads.
2. check both spacer tubes for damage to inner bore
and deformed ends. Replace if damaged.
3. Inspect the rod for wear or scratches. Clean, polish
or replace.
4. Check T seal of head for wear or damage. Clean or
replace.
5. Inspect rod o-ring for wear or damage. Clean or
replace.
6. Inspect cam roller for smooth turning. Clean or
replace.
Assembly
1. Lightly lubricate rod and slide piston with seal to
locate over o-ring at center of rod.
2. Lock piston into place with two retaining rings.
3. Slide spacer tubes from both ends of rod to rest on
retaining rings.
4. Carefully insert rod with piston and spacers into bar-
rel
5. Slide heads with wiper, rod seal, o-ring, and wear
ring onto rod from both ends.
6. Apply loctite #222 to barrel threads of both ends
and install retainer caps. Tighten with strap wrench.
Test for leakage.
2.14 TILT SWITCH INDICATOR LEVELING
PROCEDURE
PERFORM TILT SWITCH LEVELING PROCEDURE A MINIMUM OF
EVERY SIX MONTHS TO ENSURE PROPER OPERATION AND
ADJUSTMENT OF SWITCH.
Manual Adjustment
1. Park the machine on a flat level surface. Be sure it is
as level as possible, with tires filled to rated pres-
sure.
NOTE: Ensure switch mounting is level and securely
attached.
2. Tighten the three flange nuts with a socket wrench.
Each nut should be tightened approximately one-
quarter of its spring’s travel.
3. Using bubble level on top of indicator, tighten or
loosen the three flange nuts until indicator is level.
4. Individually push down on one corner at a time.
There should be enough travel to cause the indica-
tor to trip. If the indicator does not trip in all three
tests, the flange nuts have been tightened too far.
2.15 LIMIT SWITCHES
Drive Cut-Out Limit Switch
This switch is located on the front of the machine frame.
Adjust cam to trip limit switch when platform is elevated to
8 m (26 ft 2.5 in).
High Speed Drive Cut-Out
High drive speed is cut out when platform is raised above
stowed (fully lowered) position.
NOTE: There is no adjustment to be made to the Platform
Ext. limit switch which bolts on the bottom of the plat-
form (If Equipped).
Updated 6/13/00