Delta DC-580 20" PLANER 22-450 Instruction Manual page 15

CHECKING AND ADJUSTING DRIVE BELT TENSION
Proper belt tension is when there is approximately 1/4" deflection, using light finger pressure on the drive belts (A) Fig.
28, midway between pulleys. If an adjustment is necessary, proceed as follows:
B
A
Fig. 28
1. DISCONNECT MACHINE FROM
POWER SOURCE.
2. Disengage feed roller lever (B) Fig. 28.
C
3. Loosen and tighten two adjustment nuts (C) Fig. 29, to
move motor plate up or down as necessary to increase or
decrease drive belt tension.Tighten both adjustment nuts
(C) against plate (D) Fig. 29, after adjustment is made.
4. Close both side panels.
D
Fig. 29
15