JLG G6-42A Service Manual - Manual (Page 47)

3-9 G6-42A, G9-43A, G10-43A
Boom
7. Remove the guide bar (18) and chain retainer (19).
Remove the push beam wear pad (20).
8. Lower the push beam assembly and remove the pry
bars.
9. Push/pull the push beam assembly along with the
extend chain, to the front of the third boom section.
10. Place a sling around the push beam assembly. Lift
and slowly pull the push beam assembly
approximately half way out of the third boom section.
Lower the push beam onto a suitable support.
11. Relocate the sling or using two slings for better
stability, balance the push beam assembly and
slowly pull the push beam assembly out of the third
boom section. Lower the push beam assembly onto
suitable supports.
12. Remove all remaining brackets, clevises, hoses,
wear pads, shims, backing plates and hardware from
the second and third boom sections. Label all parts
and hardware being removed from each section.
Note: Inspect all chains, hoses and sheaves for wear
and/or damage and replace as needed.Safety
Information
3.5.4 Push Beam - Extend/Retract Cylinder
Installation and Third Boom Section
Assembly
Note: Inspect the wear pad surfaces of the second and
third boom sections. Verify all areas are clean and free of
any weld spatter, paint, etc., before beginning the re-
assembly procedure.
Note: Inspect and lubricate all extend and retract chains
before re-assembly. Refer to Section 3.12, “Boom
Extend and Retract Chains,” for detailed information.
1. Place the third boom section onto suitable supports.
2. Clean and lubricate the bottom and sides of the third
boom section where the push beam guide bar
travels.
3. Place a sling or using two slings for better stability,
lift and slowly push the push beam assembly
approximately half way into the third boom section.
Lower the push beam onto a suitable support.
4. Relocate the sling and slowly insert the push beam
assembly into the front of the third boom section.
5. Install the push beam wear pad (4) to the previously
removed chain retainer (5) using two bolts and two
washers. Torque as required.
6. Lift the push beam assembly (6) with pry bars using
the access holes on each side of the third boom
section and install the guide bar (7) and chain
retainer (5) using the previously removed hardware
(8). Torque to 25-30 lb-ft (34-41 Nm).
NOTICE
Guide the push beam/extend/retract cylinder
assembly over the top of the retract chain anchor at
the rear of the third boom section being careful not to
damage any components.
MY3930
18
14
20
19
NOTICE
Guide the push beam/extend/retract cylinder
assembly over the top of the retract chain anchor at
the rear of the third boom section being careful not to
damage any components.
MY3930
7
6
4
5
8