Dymo 31-250 - Manual (Page 18)

18
STEP 1 - TENSION ON TIMING BELT
1. The timing belt should be checked for the correct
tension. If the belt is too tight, the table will be difficult to
move. A loose timing belt may cause the belt to jump a
tooth on the timing gear. Deflection in the middle of the
long span should be 2 - 3 lbs to deflect the belt to the
outside frame wall.
2.
To adjust the timing belt tension, first loosen the
tension. To do this, find one of the timing belt idler rollers
under the right hand end of the unit between the timing
gears, and with a ½" wrench loosen the screw (the nut
for this screw can be seen on the topside of the base).
Do not rotate table-elevating handwheel
while the belt tension is relaxed.
3.
With the ½" wrench still on the idler screw under the
unit, push the slack of the belt toward the column end of
the unit, and tighten the screw.
Be careful
not to over-tighten the nut, because it might crush the
spacer inside. Approximately 50 in-lbs. of torque will be
sufficient. To be certain that the spacer is not damaged,
grasp the idler roller. If it can be moved approximately
1/8" vertically, the spacer is all right.
4.
With the proper belt tension try to adjust the table.
STEP 2 - CHECKING THE TABLE
SUPPORT PLATE
1. The table support plate must be mounted in a flat
plane and parallel (D) Fig. 38 to the drum. Check this with
the table mounted to the support plate. Use a 3/16" hex
wrench and ½" open end wrench to loosen the four hex
screws that attach the support plate to the elevating
screws. Place a block of wood (W) Fig. 37, metal, etc.
approx. ¾" wide x 2" to 3" tall, under the table support
plate, on the unit base next to one of the elevation
screws. Turn the elevating screw up or down until the
support plate barely clears the block. REPEAT the
clearance check at each of of the other three elevation
screws. They should be within 1/64" of each other [See
(O) Fig. 40].
2.
While holding the ½" hex on the screw, to prevent it
from turning, retighten the four hex screws.
3. With a ½" wrench and a 3/16" hex wrench, loosen
the front right socket head screw (B) Fig. 38 four full
turns[See (S) Fig. 39]. Turn the elevating screw clockwise
until it no longer touches the plate (P) Fig. 39. Then turn
the same screw counterclockwise until it just touches the
support plate without raising it (O) Fig. 40. Hold the
elevating screw(L) Fig. 38 with the ½" wrench to keep it
TABLE MOVEMENT TROUBLESHOOTING GUIDE
P
L
B
Fig. 38
Fig. 37
W
In the event your table will not adjust properly, or is tight when adjusting up and down, or the timing belt is jumping
teeth, this guide provides the information necessary to realign the table mechanism and adjust the belt tension.
DISCONNECT THE MACHINE FROM POWER SOURCE BEFORE SERVICING, MAKING REPAIRS,
OR WHEN CHANGING ACCESSORIES.
The Drum Sander feed table should adjust up or down with 35 in-lbs. of torque or less. If more torque is required, then
an adjustment may be needed. If you hear a clicking or knocking noise as you turn the handwheel, the timing belt is
most likely jumping teeth and an adjustment will be needed. Below are the four areas that most affect the table
movement. Start at the top of this trouble-shooting guide and check the first item before proceeding to the next. Once
the table movement frees up there is no need to proceed through the remaining steps.
D
D