JLG TOUCAN 10E Service And Maintenance Manual page 48

SECTION 5 - TURNTABLE AND VERTICAL MAST
JLG INDUSTRIES RECOMMEND THAT ALL REMOVED BEARING
NUTS, BOLTS AND HARDENED WASHER TO BE DISCARDED
AND REPLACED WITH NEW PARTS. SINCE THE SWING BEARING
IS THE ONLY STRUCTURAL LINK BETWEEN THE CHASSIS AND
TURNTABLE, IT IS IMPERATIVE THAT REPLACEMENT HARD-
WARE MEETS JLG SPECIFICATIONS. USE OF GENUINE JLG
HARDWARE IS HIGHLY RECOMMENDED.
3. Insert the 24 new hex. head screws M12-90 into the
outer bearing race mounting holes prior to install the
bearing on the turntable base plate.
4. Place bearing onto the turntable base plate with the
maximum eccentricity point aligned with the pinion.
Loosely install new M12x90 hex. head cap screws
and locknuts through inner race of bearing and turn-
table base plate. Apply a light coating of Loc-
tite®270 to the new M12x70 hex. head cap screws
and loosely install screws through inner race of
bearing.
5. Insert a feeler gauge of 0.20 mm (0.008 in) between
the bearing and the pinion teeth as shown below to
adjust backlash in the gear. Torque bearing bolts 30
to 35 Nm (22 to 25 lb ft). Remove the feeler gauge
and recheck backlash.
Figure 5-9. Backlash Adjustment
IF COMPRESSED AIR OR ELECTRICALLY OPERATED WRENCH
IS USED FOR TIGHTENING THE BEARING ATTACHMENT BOLTS,
THE TORQUE SETTING ACCURACY OF THE TOOL SHOULD BE
CHECKED PRIOR TO USE.
6. Following the torque sequence diagram (refer to
Figure 5-2.), tighten the bolts to an initial torque of
80 Nm (59 ft lbs). Then, following the same
sequence, tighten to a final torque of 117 Nm (86 ft
lbs).
5-4
7. Taking care not to damage the outer race bolts,
carefully lift and position the mast section #1
assembly above the machine chassis so as the
grease fittings of the bearing are positioned 90° from
chassis centerline. Align bolts with the chassis holes
and carefully lower mast section assembly. Loosely
install 3 hardened washers and locknuts to correctly
position the assembly. Lower the mast section #1
assembly onto the chassis. Slightly slack the slings/
chains but keep them in place until the assembly is
correctly secured to the chassis.
8. Loosely install all hardened washers and locknuts.
Following the torque sequence diagram (refer to
Figure 5-2.), tighten the nuts to an initial torque of 80
Nm (59 ft lbs). Then, following the same sequence,
tighten to a final torque of 117 Nm (86 ft lbs).
9. Apply a generous coating of specified lubricant on
bearing teeth with a brush and install teeth covers.
10. Secure the rotary power track to the turntable.
11. Lift the machine using suitable overhead lifting
equipment attached to both lifting rings of mast sec-
tion #1 lifting rings and remove blocks.
12. Using a suitable sling attached to the barrel, install
the mast cylinder onto mast section #1, tie cylinder
to mast section #1 with a rope and protect the
chrome surface of the rod. The cylinder must be
enough extended to be able to insert the pin.
13. Route sling(s) through mast sections assembly as
indicated in the previous removal procedure. Posi-
tion sling(s) and overhead lifting equipment acces-
sory in such a way that the mast sections assembly
remains in a vertical position when lifted.
14. Engage mast sections assembly in mast section #1
profiles till being able to install mast cylinder anchor
pin. Install and correctly bend the cotter pin.
15. Loosely install the roller pin locknuts at the bottom of
mast section #2.
16. Remove the plug from the cylinder port. Slowly and
carefully lower the mast assembly to be able to run
the chain anchors through attachment holes on
mast section #1 and to install attachment nuts.
Once attachment nuts are installed, continue lower-
ing the mast assembly until the cylinder is fully
retracted.
17. Tighten attachment nuts until the required distance
between the top of the chain attachment plate and
the top end of the chain anchor is obtained (Refer to
Section 5-5). Slack and remove sling(s) from mast
sections assembly.
18. Install chain slack detection system and locknut.
Secure mast inner power track with hardware.
Attach chain slack sensor cable to cylinder barrel
with plastic straps.
– JLG Lift – 31210090