Graco A Series Instructions-Parts List Manual page 10

Servicing the Gear Reducer
You may want to have the Bearing Replacement Kit on
hand before you begin this procedure. To order a
Bearing Replacement Kit, order Part No. 238–251.
Disassembling
The following procedure does not require that you
remove the agitator from the drum of material:
1. If your agitator has a siphon kit, do steps 2 through
4 in Cleaning an Agitator with a Siphon Kit on
page 9. If your agitator does not have a siphon
kit, proceed to step 2 below.
2. Raise/support the drum cover above the drum high
enough so that you can reach the underside of it.
3. Remove the three hex head screws (25) that hold
the agitator to the drum cover.
4. Raise the agitator housing 4 to 6 in. (100 to
150 mm) above the drum cover, and support it at
that height with blocks.
5. Tightly grip the agitator shaft with a clamp to
prevent the shaft from falling into the drum.
6. Remove the two short bolts (11) and the two long
bolts (19) that hold the upper housing (8) and the
lower housing (13) together. Carefully lifting
straight up, lift the upper housing off of the lower
housing.
7. Turn the large gear (10) counter-clockwise to
remove it from the agitator shaft, and lift the
pinion/gear assembly (3, 16) out of the lower
housing.
NOTE: Before you do step 8, check to be sure the
agitator shaft is well secured. See step 5.
8. Turn the 50 mm nut (26) counter-clockwise to
remove it from the agitator shaft.
9. Carefully lift the lower housing (13) off of the
agitator shaft.
Cleaning and Servicing
1. Clean any foreign material off of the outside of the
upper and lower housings (8 and 13).
NOTE: Do not lose the two small thrust balls (4).
One is in the upper housing (8), and one is in the
lower housing (13).
2. Inspect the parts for any wear. If any of the parts
are worn or damaged, replace them. The Bearing
Replacement Kit contains replacement bearings
and seals (items 2, 7, 9, 12, 14, and 15).
Service
Reassembling
NOTE: See the Parts Drawing on page 4 for proper
bearing and seal placement and orientation.
1. Reposition the lower housing (13) on the agitator
shaft.
To prevent damage to the bearings and seals,
avoid scraping them against the threaded agitator
shaft while you are lowering the lower housing in
place.
2. Thread the 50-mm nut (26) onto the agitator shaft
by turning it clockwise, and tighten it hand tight.
3. Reposition the pinion/gear assembly (3, 16) in the
lower housing, thread the large gear (10) onto the
agitator shaft, and tighten the large gear hand tight.
4. Make sure the small thrust balls (4) are in place.
5. Carefully lowering it straight down, reposition the
upper housing (8) on the lower housing (13).
6. Replace the two short bolts (11) and the two long
bolts (19) that hold the upper housing (8) and the
lower housing (13) together, and torque the bolts to
75 in-lb (8.5 N-m).
7. Remove the blocks that you have supporting the
agitator housing, and reposition the agitator on the
drum cover.
8. Thread the three hex head screws (25) up through
the drum cover and into the agitator, and torque
them to 75 in-lb (8.4 N-m).
9. If your agitator has a siphon kit, re-install it by doing
the reverse of steps 2 through 4 in Cleaning an
Agitator with a Siphon Kit on page 9.
Additional Agitator Service
If the unit requires more than installation of a bearing
replacement kit or gear replacement, it may be
advisable to send the unit to a Graco distributor for
repair or replacement.
CAUTION