Model 4700 Maintenance Manual
Section 7. Component Procedures
Mast
Quad Mast Service to the lower end of the outer intermediate upright. • Roller Shimming - Install shims to provide a total side-to-side clearance of 0.06 in. (1.5 mm) max. at the tightest point throughout the travel of the upright. See Figure 7-100. Pry between the upright and the load roller so that the opposite load roller is tight against the upright. Measure the clearance for the pair of rollers at the XXX shown in Figure 7-100. Use an equal number of shims on each side.
NOTE: Roll the uprights past installed thrust plugs/blocks before checking load roller clearance. • Thrust Plug/Block Replacement - Install thrust plugs/blocks to provide a clearance of 0.06 in. (1.5 mm) max. between an upright and its corresponding thrust plug/block. See Figure 7-101. Pry between the upright upper cross members. Measure the clearance at the XXX shown to determine which thickness thrust plug/block to use. Thrust plugs/blocks may be shimmed as required.
4. Lubricate the full length of the outer intermediate upright rails. See “Lubrication Specification Chart” on page A-2 and Figure 7-100. 5. Attach an overhead hoist to the inner intermediate upright and install it through the top end of the outer intermediate upright. Position it out the lower end of the outer intermediate upright approx. 6 in. (15 cm). 6. Install shims and load rollers to the lower end of the inner intermediate upright. Install shims, load rollers, and thrust plugs to the upper end of the outer intermediate upright. Refer to step 3 for roller shimming and thrust plug clearance measurement. 7. Install the chain sheaves to the upper end of the outer intermediate upright. Install the outer main lift chain anchors and chains over the outer intermediate upright chain sheaves.
Figure 7-100. Load Roller Clearance/Channel Lubrication 1
4 Lube
Upright Rails
Upright Rail Shim Load Rollers
3 .06 in. (1.5 mm) Max.
MA0259.eps
Note: Bubbled numbers refer to steps in associated procedure.
Publication 1160093, Issued: 20 May 2013
7-81
