Boom Assembly; Removal - JLG 400S Service And Maintenance Manual

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4.5 BOOM ASSEMBLY

NOTE: The 400S main boom assembly weighs approximately

1300 lbs. (600 kg). The 460SJ main boom assembly weighs

approximately 1700 lbs. (790 kg).

1. Remove the jib and platform assembly. Refer to

Section 4.2 - Platform and Section 4.6 - Jib (460SJ Only).

2. Using suitable lifting device, adequately support boom

assembly weight along entire length.

3. Attach an adequate supporting device to the main lift

cylinder and master cylinder to support its weight.

NOTE: The main lift cylinder weighs approximately 260 lbs.

4. Remove bolt and keeper pin from main lift cylinder pin

NOTE: The master cylinder weighs approximately 66 lbs. (30 kg).

5. Remove bolt and keeper pin from master cylinder pin

6. Remove bolt and keeper pin from main boom pin #3.

7. Tag and disconnect hydraulic lines from telescope cylin-

8. Using all applicable safety precautions, carefully lift

MASTER CYLINDER

Figure 4-13. Main Boom Removal

SECTION 4 - BOOM & PLATFORM

#1. Using a suitable brass drift and hammer, remove the

cylinder pin #1 securing main lift cylinder to main boom.

#2. Using a suitable brass drift and hammer, remove the

cylinder pin #2 securing master cylinder to main boom.

Using a suitable brass drift and hammer, remove the pin

#3 securing main boom to turntable.

der. Use suitable container to retain any residual hydrau-

lic fluid. Cap or plug all openings of hydraulic lines and

boom assembly clear of turntable and lower to ground

or suitably supported work surface.