Specifications

Vehicle System Testing & Adjusting 64
Mast Adjustment - Quad
NOTE: The Standard, Full Free Lift, Full Free Triple
Lift and Quad Lift mast load bearings are all
adjusted the same way. The mast shown in the
following illustrations is mainly the Full Free Triple
Lift mast, but for necessary points illustrations of
Quad Lift mast are inserted.
To make the mast clearance adjustments, mast
must be removed from the lift truck.
Carriage, chain and lift cylinder must be removed
from the mast for easy adjustments.
Use the procedure that follows to adjust the load
bearings.
A. Lower Bearing Adjustment of Outer
Intermediate Mast
Mast Adjustment Lower Bearings
(A, B, C) Zero clearance. (D) Minimum clearance.
(3, 4, 5) Bearing. (6, 7, 8) Shims.
1. Select lower bearings (3), (4) and (5) from the chart
to obtain minimum clearance (D) between bearing and
channel leg for full channel length. 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(4.135 in)
D581816 Over Size 110.7 mm(4.358 in)
* Permissible tolerance ±0.08mm (.003in)
2. Find narrowest point by ruler on the stationary
mast in the area where the bearings make
contact at 475 mm (18.7 in) channel lap.