Install The Belt; Tighten The Belt - Craftsman 139.18489DS Owner's Manual

ASSEMBLY STEP 4

Install the Belt

1. Pull the belt around the idler pulley and toward the trolley.
The ribbed side must contact the pulley.
2. Hook the trolley connector into the retaining slot on the trolley
as shown (Figure 1).
3. With the trolley against the screwdriver, dispense the
remainder of the belt along the rail length toward the motor
unit and around the sprocket (Figure 2). The sprocket teeth
must engage the belt.
4. Check to make sure the belt is not twisted. Connect the trolley
threaded shaft with the master link (Figure 3).
• Push pins of master link bar through holes in end of belt and
trolley threaded shaft.
• Push master link cap over pins and past pin notches.
• Slide clip-on spring over cap and onto pin notches until both
pins are securely locked in place.
5. Remove the spring trolley nut from the threaded shaft.
6. Insert the trolley threaded shaft through the hole in the trolley.
ASSEMBLY STEP 5

Tighten the Belt

1. By hand, thread the spring trolley nut on the threaded shaft
until it is fi nger tight against the trolley. Do not use any tools.
Remove the screwdriver.
2. Insert a fl athead screwdriver tip into one of the nut ring slots
and brace it fi rmly against the trolley.
3. Tighten the spring trolley nut with an adjustable wrench or a
7/16" open end wrench about a quarter turn until the spring
releases and snaps the nut ring against the trolley. This sets the
spring to optimum belt tension.
HARDWARE SHOWN ACTUAL SIZE
Master Link
Threaded Shaft with
Spring Trolley Nut
Figure 1
Trolley Connector
Retaining
Slot
Nut Ring
BEFORE
1"
(2.5 cm)
10
Figure 2
Sprocket
Figure 3
Master Link Cap
Master Link
Clip-On Spring
Pin
Notch
Trolley
Master
Threaded
Link Bar
Shaft
Nut Ring
Slot
Nut Ring Spring Trolley
Nut
AFTER
1-1/4"
(3.18 cm)