Hyd-Mech S-20H, Operations & Maintenance Manua

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Pg 19
S22Hna 2002a
BELT TENSION ADJUSTMENT
Drive belt tension is maintained by the locking of a toggle clamp assembly. The release of the toggle clamp
permits the drive belt to be loosened so that the blade speed can be changed by selecting a different pulley ratio.
STEP 1 Stop the blade motor. Undo the cover latch and
swing the pulley cover away.
STEP 2 At midpoint between pulleys, you should be able
to push the belt in 1/2”. Too much or too little movement will
cause slippage or abnormal wear on the belt and other drive
system parts.
STEP 3 If adjustment is needed, loosen the lock nut with
a 9/16" wrench and turn the adjusting bolt until the belt
tension is set.
STEP 4 Tighten the lock nut, test the belt on all 4 speed
positions. Close cover.
HEAD DOWN LIMIT SWITCH
The Head down limit switch operates to cut power to the blade motor and the
coolant pump motor when the Head has descended to the bottom of its travel. The
Head is adjusted so that the blade will descend slightly past the level of the vise wear
strips. This setting is critical to ensure that the blade has cut fully through the stock.
The Head Down Limit switch is located in the electrical box and is mounted in such a
way that as the Head descends the counterbalance spring post contacts the limit
switch roller.
Adjustment of the limit switch is made by changing the position of the set bolt which
is located in the end of the spring post. Lengthening the set bolt will cause the limit
switch to activate sooner as the spring post meets the limit switch roller. Shortening
the setting bolt by turning it into the spring post will lengthen the time before the Head
limit switch is activated.
Head Down Limit
Switch & Adjusting Bolt
(inside control box)
Toggle Tensioner Adjustment Locknuts