Steris Amsco 3085 SP Maintenance Manual Download Page 115

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7-10

764332-898

7.16 LASH ADJUSTMENTS

If it has been determined that the table lash needs
adjusted (refer to

Step 4

), proceed as follows:

NOTE: Lash is the clearance or "play" between adjacent
movable mechanical parts.

7.16.1 Longitudinal Lash Adjustment

NOTE: The numbers in parentheses () refer to items found
on Figure 7 located in Illustrated Parts Breakdown (refer to
Tab) unless otherwise noted.

1. Longitudinal lash is controlled by moving

adjustable guide shaft (4) on head-end side of
column. Guide shaft is secured to column by seven
1/2" hexhead cap screws (8). Five setscrews (12) are
provided on backer (pressure) plate to aid in
adjustment.

2. Check column for lash (refer to

Step 4

) with tabletop at

minimum, medium and maximum elevations. In
most cases, excessive lash is found only at one
elevation, and adjustment should be made only in
that area. If lash is excessive at all elevations, adjust
as follows:

Loosen seven screws (8), then finger-tighten
them. Starting with column fully down, tighten
bottom setscrew until gaps between guide rod
bearings and guide rods are minimal. Raise
column to midpoint, then repeat tightening
procedure on middle setscrew. Raise column to
uppermost position and repeat tightening
procedure on upper setscrew.

Firmly tighten top hex head screw. Lower
column to midpoint and firmly tighten middle
screw. Lower column to bottom and firmly
tighten bottom screw. Firmly tighten
remainder of screws as column is being raised,
with one guide rod being above and one below
screw being tightened. Turn in remaining
setscrews until they bottom.

Check column motion while it raises and
lowers. Movement up and down should be free
with no sticking, minimal bearing lash and
uniform speed. If problems are encountered,
repeat

Steps a and b

. Occasionally it may be

necessary to make adjustments at intermediate
points between top and middle, or bottom and
middle. Make these adjustments by repeating

Steps a and b

Torque seven 1/2" (13 mm) hex head machine
screws to 150 ± 5 ft-lb (203 ± 7 N•m). Recheck
column motion as outlined in

Step c

NOTE: Do not remove all of the column lash or
inadvertently make the column too tight, creating
excessive loads on the bearings and producing
premature bearing failure. Removing all lash could
also produce a sticking condition on the column so
that it will not lower after remaining at one height
for a period of time.

7.16.2 Lateral Lash Adjustment

1. Longitudinal lash must fall within allowable limits

before lateral lash adjustment is started.

2. Lateral lash is controlled by adjusting four socket

head cap screws adjacent to bearings in top column
section. Each screw controls lash only for its
adjacent bearing. Turning screws clockwise
decreases lash, and turning them counterclockwise
increases lash.

3. Raise tabletop near maximum height, until two

bottom socket head screws are in line with two
access holes in bottom column section.

4. Lash can occur in any of four bearings; however,

only certain combinations produce lateral lash: all
four bearings, any three bearings and two top
bearings. Determine which bearings require
adjustment and adjust only ones with lash.

5. Turn socket head cap screw until lash is removed

from bearing and then back it off about 1/16 of a
revolution.

6. Check column motion as it is raised and lowered. It

should move up and down freely, with no sticking,
minimal bearing lash and uniform speed. If
problems are encountered, repeat

Steps, 3, 4 and 5

NOTE: Do not remove all of the column lash or
inadvertently make the column too tight, creating
excessive loads on the bearings and producing premature
bearing failure. Removing all lash could also produce a
sticking condition on the column so that it will not lower
after remaining at one height for a period of time.

7.16.3 Rotational Lash Adjustment

1. Longitudinal lash must fall within allowable limits

before rotational lash adjustment is started.

2. Rotational lash is controlled by adjusting four

socket head cap screws adjacent to bearings in top
column section. Each screw controls lash only for
adjacent bearing: turning screws clockwise
decreases lash; turning screws counterclockwise
increases lash.

3. Raise tabletop until two bottom socket head cap

screws are in line with two access holes in bottom
column section (nearly maximum height).