Adjusting X-Axis Leadscrew Backlash; Replacing Fuse; Replacing Motor Brushes - Grizzly G8689Z Owner's Manual

Adjusting X-Axis
Leadscrew Backlash
Leadscrew backlash is the amount of free-play
movement in the leadscrew (when changing the
direction of rotation) before the attached device
begins to move.
Leadscrews must have a certain amount of back-
lash, but over time, this will increase with normal
wear. Generally, 0.003"–0.006" leadscrew back-
lash is acceptable to ensure smooth movement
and reduce the risk of premature thread wear.
The X-axis leadscrew backlash is adjusted by
tightening/loosening the set screws that con-
tact the leadscrew nut through the saddle. This
adjusts the force that the leadscrew nut exerts on
the leadscrew threads.
The X-axis leadscrew backlash set screws are
accessed from underneath the right side of the
table (see Figure 55).
x 2
Figure 55. Location of X-axis leadscrew back-
lash set screws.
Tool Needed
Hex Wrench 3mm .............................................. 1
-36-

Replacing Fuse

This machine features a fuse designed to protect
sensitive electrical parts in the event of electrical
overload. If the fuse burns out, replace it.
Items Needed
Phillips Head Screwdriver #2 ............................ 1
Replacement Fuse 5A 250V (P8689Z411-10) .... 1
To replace fuse:
1. DISCONNECT MACHINE FROM POWER!
2. Turn fuse holder cap counterclockwise to
remove (see Figure 56).
Figure 56. Location of fuse holder cap.
3.
Replace fuse, install fuse holder cap, and turn
clockwise to secure.
Motor Brushes
This machine is equipped with a DC motor that
uses carbon brushes to transmit electrical cur-
rent. These brushes are considered to be regular
Qty
"wear items" or "consumable" that will need to be
replaced during the life of the motor. The frequen-
cy of required replacement is often related to how
much the motor is used and how hard it is pushed.
Replace both carbon brushes at the same time
when the motor no longer reaches full power,
or when the brushes measure less than
(new brushes are
Fuse Holder
Cap
Replacing
⁄ ").
5
8
Model G8689Z (Mfd. Since 07/23)
Qty
⁄ " long
1
4