Jlg 40H Service Manual User Manual download pdf (Page 37)

SECTION 2 - PROCEDURES

3120240 – JLG Lift – 2-17

2. Measure the inside dimensions of the base section

to determine the number of shims required for

proper lift.

3. Install side wear pads to the aft end of the fly sec-

tion; shim evenly to the measurements of the inside

of the mid section.

NOTE: Step 4 applies to 2 Section Boom Only.

4. Install side wear pads to the aft end of the fly sec-

tion; shim evenly to the measurements of the inside

of the base section.

5. Install the side wear pads to the aft end of the mid

section; shim evenly to the measurement of the

inside of the base section.

6. Shim the insides of the boom sections for a total of

1/16 inch (.062) clearance (if the action is centered,

there will be 1/32 clearance on each side).

NOTE: Steps 7 and 8 apply to 2 Section Boom Only.

7. Slide fly section into the base section a distance of

approximately one foot; measurement of the inside

of the base section top wear pad clearance and fab-

ricate shim packs.

8. Remove the fly section from the base section and

install two top wear pads and a shim pack. Shim the

top of the fly section for a total of 1/16 inch (.062)

clearance.

9. Slide fly section into the mid section a distance of

approximately one foot; measurement of the inside

of the mid section top wear pad clearance and fabri-

cate shim packs.

10. Remove the fly section from the mid section and

install two top wear pads and a shim pack. Shim the

top of the fly section for a total of 1/16 inch (.062)

clearance.

11. Slide the mid section into the base section a dis-

tance of approximately one foot; measurement top

wear pad clearance and fabricate shim packs.

12. Remove the mid section from the base section and

install two top wear pads and a shim pack. Shim the

top of the mid section for a total of 1/16 inch (.062)

clearance.

13. Attach the extension chain to the appropriate clevis

attachment point of the chain block weldment by

installing the clevis pin and washer through the

attach holes; secure the clevis pin with a new cotter

pin. Place the chain block weldment in position at

the aft end of the fly section; secure the weldment by

installing the bolts and washers.

WHEN ASSEMBLING BOOM SECTIONS, ENSURE THAT THE

BOOM SLIDING TRAJECTORIES HAVE BEEN CLEARED OF

CHAINS, TOOLS, AND OTHER OBSTRUCTIONS.

14. mid section. Shim boom, if necessary, for a total of

1/16 inch (.062) clearance.

NOTE: Step 15 applies to 2 Section Boom Only.

15. Install wear pads into the forward portion of the base

section. Shim boom, if necessary, for a total of 2/10

inch (.20) clearance.

16. Install wear pads into the forward portion of the mid

section. Shim boom, if necessary, for a total of 2/10

inch (.20) clearance.

17. Align the attach points of the retraction chains with

those of the chain attachment block, located at the

aft end of the fly section. Install the clevis pins and

washers through the attaching holes of the chains

and block; secure the clevis pins by installing new

cotter pins.

18. Properly position the retraction chain sheave assem-

blies at the aft end of the mid section; ensure all

sheave-to-mounting block attachment holes align.

Install the sheave pin and secure by installing the s

setscrews. Position the retraction chains onto the

sheaves.

19. Align the telescope cylinder base-to-sheave attach-

ment points. Install the sheave pin through the cylin-

der base and sheave assembly; secure the pin with

bolt and washer.

20. Secure the sling and lifting device at the telescope

cylinder’s approximate center of gravity, and lift the

cylinder to the aft end of the boom assembly.

WHEN INSERTING THE TELESCOPE CYLINDER INTO THE BOOM,

IT MAY BE NECESSARY AT SOME POINT TO TURN THE CYLIN-

DER SLIGHTLY IN ORDER TO CLEAR ASSEMBLIES MOUNTED

WITHIN THE BOOM. CARE MUST BE TAKEN TO MOVE THE CYL-

INDER SLOWLY INTO POSITION: DAMAGE TO COMPONENTS

MAY RESULT FROM FORCIBLE IMPACT WITH THESE ASSEM-

BLIES.

21. Position the free end of the extension chain around

and over the sheave; slowly slide the cylinder into

the boom while maintaining tension on the chain.

(This will keep the chain properly seated in the

sheave groove throughout installation).

NOTE: Step 22 apply to 2 Section Boom Only.

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Jlg 40H Service Manual User Manual Page 37

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