5
Figure 2
Tracking adjustment
Tracking adjustment requires
the sander to be connected to the hose and
running. Use caution when hands and tools are
close to a running belt. Failure to comply may
cause serious injury.
Belt is tracking properly on all models when
centered on the idle pulley.
JSM-606:
no adjustment
JSM-610/612:
1. Loosen set screw with wrench. See Figure 3.
2. With belt running, turn adjusting screw
clockwise or counterclockwise until it is
centered on the idler pulley.
3. Tighten set screw.
Figure 3
JSM-620/630:
Insert hex wrench into hex socket cap screw and
turn clockwise or counterclockwise until belt is
centered on idle pulley. See Figure 4.
Figure 4
Belt replacement
JSM-606/610:
1. Disconnect sander from air source.
2. Loosen hex cap screw (A, Figure 2), turn head
90-degrees to the handle, and tighten screw to
lock. See Figure 5.
3. Steady the sander with one hand while
pushing down on the idle wheel assembly with
the other until assembly locks in place. See
Figure 5.
4. Remove old belt. Install new belt.
5. Press safety lever (A, Figure 5) to tension belt.
Figure 5
JSM-612:
1. Disconnect sander from air source.
2. Loosen hex cap screw (A, Figure 2), turn head
90-degrees to the handle, and tighten screw to
lock. See Figure 6.
3. Steady sander with one hand while pushing
down on the idle pulley assembly and
removing belt with the other.
4. Install new belt over idle pulley.
5. Push idle pulley assembly down and place belt
on drive pulley. See sequence in Figure 6.
