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© Ferno-Washington, Inc 234-3479-02
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Maintenance
9.9 adjusting the belt Tension
TOOLS NEEDED
1 ea.
13 mm Socket Wrench (or 1/2 in Wrench)
1 ea.
6 mm Allen Wrench
1 ea.
2.5 mm Allen Wrench
Over time, the belts may become loose due to wear, or the
tension of the two belts may become uneven.
Adjusting the belt tension is a two-person operation.
1. Open the track system and engage both wheel locks.
2. Using a 6 mm Allen wrench and a 13 mm socket
wrench (or 1/2" wrench), loosen the large tension-
wheel screw (Figure 56).
3. Using a 2.5 mm Allen wrench, loosen each of the two
small tensioning-plate screws (Figure 57).
4. While one person pulls the “wings” of the tensioning
plates in opposite directions (one toward the chair seat
and one away from the chair seat), the other person
uses the 2.5 mm Allen wrench to tighten the two
tensioning-plate screws (Figure 58).
5. Using a 6 mm Allen wrench and a 13 mm socket
wrench (or 1/2" wrench), tighten the large tensioning-
wheel screw.
6. Repeat Steps 2-5 for the second track.
7. Verify the belt tension.
○
The tension of the two belts should be even.
○
Check by pulling each belt away from the track by
hand. Pull at the center of the track (not on the top
or bottom end). Measuring from the black track
frame to the closet edge of the belt tooth, the belt
should not pull more than 1/4"-3/8" (6.4-9.5 mm)
from the frame.
Note:
It may be necessary to repeat the tensioning and
measuring one or more times to achieve the correct tension.
Note:
If the belts cannot be properly tensioned, they may
need to be replaced. Contact EMSAR (in the U.S.A. or
Canada) or your Ferno distributor for parts and service
(see
Parts and Service,
pages 44-45 ).
Person #2 with Wrench
Person #1 Adjusts Plates
Loosen the Tension
Wheel Screw
56
Loosen the
Tension-Plate Screw
(Each Side)
57
58
Adjusting Belt Tension
Adjusting the belt tension is a two-person
operation.