Adjusting Spring Tension - Grizzly T31739 Owner's Manual

Adjusting
Spring Tension
The spring tension for automatic quill recoil has
been pre-set at the factory. In most cases, it will
never need to be re-adjusted during life of the
machine. However, if quill stops automatically
recoiling, the spring may need to be adjusted for
additional tension. If it does need adjustment, the
spring housing is located on the left side of the
headstock.
If the return spring should
come loose from the spring
cap and rapidly unwind,
laceration or impact inju-
ries could occur. Always
wear heavy leather gloves
and safety glasses when
adjusting the return spring
tension.
Items Needed
Heavy Leather Gloves ................................1 Pair
Safety Glasses ...........................................1 Pair
Shop Rags ......................................... As Needed
Open-End Wrench 19mm .................................. 1
To adjust spring tension:
1. DISCONNECT MACHINE FROM POWER!
2. PUT ON SAFETY GLASSES!
3. Wipe any oil off spring lock cover so it does
not slip in your fingers when you hold the
cover from spinning (see Figure 55).
4. Hold spring lock
of headstock so the cover stays splined
with locking lug, as shown in Figure 55,
then loosen jam nut and loosen cover nut
⁄ " each.
approximately
1
4
IMPORTANT: Hold spring cover tightly dur-
ing Step 5, or force of spring will cause cover
to spin out of your hands.
Model T31739 (Mfd. Since 11/19)
Qty
cover against side
5. Wearing gloves, pull spring cover (see Figure
55) outward just enough to disengage spring-
cover lock slot from locking lug.
6. Rotate cover counterclockwise to increase
tension, or let cover slowly unwind in clock-
wise direction to reduce spring tension (see
Figure 54).
Reduce Spring Tension
Increase Spring Tension
Figure 54. Example of adjusting cover.
7.
Engage next available spring-cover lock slot
with locking lug (see Figure 55) and hold
spring lock cover tightly to side of headstock.
Spring Lock
Cover
Jam Nut and
Cover Nut
Figure 55. Spindle return spring assembly.
8. Tighten cover nut against spring cover
just until nut stops, and then back off nut
approximately ⁄ turn.
1
3
9. Hold cover nut and tighten jam nut to cover
nut.
10. Check return spring tensioning by downfeed-
ing spindle. Spindle should return quickly
when downward pressure is released.
— If spindle does not retract quickly, repeat
Steps 4–9, and re-check tension until
return speed is adequate.
Spring Cover
Locking Lug
Spring Cover
Lock Slots
-35-