Woodhead BF Series - Manual (Page 2)

SM1120-01 E Page 2 of 4 ©Aero-Motive Company Sep-01
SPRING TENSION ADJUSTMENT
CAUTION:
Do not push tension lock lever without placing wrench onto mainshaft first. Extreme
amounts of stored spring torque will turn mainshaft rapidly clockwise. Hazards or unsafe
practices COULD result in minor personal injury or product or property damage.
NOTE: Do NOT over-tension balancer main spring. This will reduce cable travel and spring life.
NOTE: If drum locks up (cable will not pull out) when reducing spring tension, increase tension until
automatic lock disengages. (See Automatic Lock)
Observe following before making spring tension adjustments:
• Tool and all accessories are attached to tool clip.
• All balancers are factory pre-set.
• Tool will lower if the weight of tool exceeds tension
adjustment of balancer mainspring.
• If cable stop is up against cable guide prior to adjustment,
there is too much tension on balancer mainspring.
To increase spring tension, turn mainshaft with wrench ¼ turn
(one click at a time) in a counter-clockwise direction ( “+” symbol
on case). Repeat process until desired tension is achieved.
To reduce spring tension, turn mainshaft with wrench in counter-
clockwise direction until tension lock lever disengages. Hold
tension lock lever in disengaged position and allow mainshaft to
turn clockwise. Repeat process until desired tension is achieved.
CABLE STOP ADJUSTMENT
NOTE: Make all cable stop adjustments after tool and accessories have been attached to tool clip and
after adjusting spring tension. (See Spring Tension Adjustment)
NOTE: Moving cable stop and bumper closer to the cable guide will shorten active travel of cable.
Loosen two hex nuts and machine screws. Slide cable stop and bumper up or down on cable so that tool
is positioned at desired working height. Tighten loosened hardware to hold cable stop at set position.
AUTOMATIC LOCK
WARNING:
Never remove spring from drum and spring assembly. Replacement springs are sealed
for safety. Hazards or unsafe practices COULD result in severe personal injury or death.
If tension is reduced to below rated range, automatic lock will engage and prevent cable drum from
turning. Increase tension until automatic lock disengages. If a spring should break, automatic lock will
engage to prevent drum from turning. Lock will disengage after new spring assembly is installed.
SERVICE
TOOL REPLACEMENT
When replacing tool and attachments, make sure cable is fully retracted. (See Tool Attachment).
DRUM & SPRING ASSEMBLY REPLACEMENT
Remove balancer from service and remove all spring tension from balancer. (See Spring Tension
Adjustment). Remove two screws and cable guide. Remove four screws and nuts. Remove rear case
assembly & retaining ring from mainshaft. Remove mainshaft, hub and tension lock and cable assembly
with all attached parts from drum and spring assembly. Remove cable assembly from old drum and
spring assembly. Attach cable assembly to new drum and spring assembly (See Cable Replacement).
Reassemble unit in reverse order. Place balancer back in service and attach tool. (See Tool
Attachment). Set spring tension with tool and attachments in place. (See Spring Tension Adjustment.).