Specifications

Vehicle System Disassembly & Assembly 30

D. Lower Bearing Adjustment of Inner Mast

Mast Adjustment Lower Bearings

(A) Zero clearance. (B)Minimum clearance. (C)Zero clearance.

(3) Bearing. (4) Bearing. (5) Shims. (6) Shims.

13. Select lower bearings (3) and (4) from the chart to

obtain minimum clearance (B) between bearing

and channel leg for full channel length. Must use

same bearing on left and right side.

Mast And Carriage Bearings

Part No. Bearing Size Bearing O.D. *

D581814 Under Size 108.6 mm (4.276 in)

D581815 Standard 109.6 mm (4.276 in)

D581816 Over Size 110.7 mm (4.358 in)

* Permissible tolerance ± 0.08mm (.003in)

14. Find narrowest point by ruler on the intermediate

mast in the area where the inner lower bearings

make contact full length of intermediate mast

excluding minimum channel lap 475 mm (18.7 in).

15. Install 1 mm shim to each bearing of inner lower

and intermediate upper basically. Lifting by crane,

insert inner mast into intermediate mast from the

upper side.

Mast Adjustment Lower Bearings

(A) Zero clearance. (B) Minimum clearance. (C) Zero clearance.

(3) Bearing. (4) Bearing. (5) Shims. (6) Shims.

16. Make sure inner mast lower bearings are properly

shimmed in the intermediate mast by rolling up

and down and moving inner mast to right and left.

If clearance between both masts can be detected,

pull down the inner mast from the bottom of

intermediate mast. Inner lower bearings can be

easily extruded. Add shim 0.5 mm or 1 mm to

both inner lower bearings. If inner mast is stuck

and cannot move by rolling up and down, there

might be excessive shim. Pull out the inner mast

from the intermediate mast and remove shim 0.5

mm to both inner lower bearings. Repeat same

procedure of above until properly shimmed. There

is to be contact zero clearance (C) between inner

lower bearings and intermediate channel at

narrowest point.

IDCS123S

4 5 6

IDCD040P

IDCD031P