AIRLESSCO GS6250 - Manual (Page 18)

Clutch Replacement
18 3A1187E
7. Screw differential screw, into coupling screw and nut
until 1/16” is showing. See Clutch Assembly, page
27
8. Push coupling nut assembly, into clutch assembly
until it comes to a positive stop. (Differential screw
comes into contact with the threaded gearbox
shaft.)
9. With 13/16” wrench on coupling screw and 5/16”
allen wrench in differential screw, simultaneously
with both wrenches screw coupling nut assembly
into gearbox shaft by turning clockwise until a posi-
tive stop is reached.
10. Hold coupling nut assembly and tighten differential
screw to 30 ft.-lbs. This will expand the coupling
assembly, thereby holding the clutch assembly to
gearbox shaft. Turn clutch observing clutch gap.
The pulley should turn freely with a gap of .012 to
.024” between the two clutch faces. If the gap is
greater than .024, remove the removable spacer.
Reassemble and check gap for proper clearance.
11. Place cog belt over cog pulley portion of clutch. Set
gearbox and clutch assembly on the support brack-
ets (Power unit Assembly, Ref. 25 & 26), screw in
the two vertical bracket screws (Power unit Assem-
bly, Ref. 20) and start the four horizontal screws
throughout the gearbox plate (Belt Tensioning, Ref.
25 & 26) and into the back of the gearbox.
12. Slide cog belt over engine pulley.
Belt Tensioning
Refer to the following parts diagrams: Belt Tensioning,
Suction Assembly, and Power Unit Assembly
1. Slightly loosen the two horizontal screws (Power
unit Assembly, Ref. 19-22) that connect the top and
bottom supports (Power unit Assembly, Ref. 24 &
25).
2. Evenly tighten set screws (Belt Tensioning, Ref. 6)
until flush with tip of block tensioner (Belt Tension-
ing, Ref. 7). Check tension on cog belt by pressing
hard with thumb. Proper tensioning should allow for
approximately 1/8”. If belt is too loose, tighten set
crews further.
3. Once belt tension is correct tighten down the four
horizontal screws that go through the gearbox plate
(Power Unit Assembly, Ref. 8) and into the back of
the gearbox. Also tighten the two horizontal screws
(Power Unit Assembly, Ref. 19-20) that connect the
top and bottom supports (Suction Assembly, Ref. 24
& 25). Reconfirm that the belt deflection is still 1/8”.
4. Reassembly connections, covers and fluid pump in
reverse order as described in steps 1-7 of Removing
Clutch instructions, page 17.