Dover OPW 790B-0030 Manual de inicio rápido - Página 3
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Travel Stop 788, 789, 790 Series
Upward
Snubber Block
Remove the (4) socket head screws in snubber
block, then rotate snubber block toward pivot
pin to allow for more upward travel or away
from pivot pin for less upward travel.
Replace the (4) screws and tighten.
Adjustment 788, 789 Series
When to adjust torque
NOTE: Left hand spring balance shown.
NOTE: The worm gear adjustment mechanism provides significant mechanical advantage during adjustment.
Under high load conditions (790) it is recommended that the loading arm be raised to approximately 45° above horizontal.
Under low load conditions it is possible to adjust the spring torque without raising/supporting the loading arm.
Torque
For more lifting action increase torque.
For less lifting action decrease torque.
1. Raise loading arm to highest position and secure.
2. Hold Adjusting Nut of Spring Regulator [2] with a large wrench.
3. Loosen lower Bolt of Spring Keeper and remove upper one.
Using a large screwdriver push Spring Keeper forward. With
Spring Keeper disengaged turn Spring Regulator Adjusting Nut
clockwise for more or counter clockwise for less torque.
4. With spring tension in desired position press Spring Keeper back
into position on Spring Regulator. While holding Spring Regulator
Adjusting Nut, tighten Spring Keeper Bolts [3]. Be sure Lock
Washers [4] are in place.
5. Minor adjustment can be achieved by turning the Spring Keeper
½ position. This is done by removing the 2 Keeper Bolts [3] and
turning the Spring Keeper end for end, so that the "teeth" of the
Spring Keeper will be reversed.
Pivot Pin
790 Series Counterbalance
Downward
Jam Nut
Loosen Jam Nut (located below lever arm) and
turn stop bolt in for more downward travel or
out for less downward travel. Then hold bolt
and tighten jam nut securely.
788, 789 Series
Spring Keeper Bolts
Adjusting Nut
Spring Keeper
Spring Regulator
Stop Bolt