Alemite 338905 Operating instructions

SERVICE INSTRUCTIONS 33
8905
Air Motor
DESCRIPTION
The air motor has a 3" diameter piston with a 1-5/8"
stroke.
When the pump-tube upper packing is
not
incorporated into the air motor, the air motor is
considered a divorced pump. Divorced pumps
are
used with a variety of products, since materials can't
move past the base packing. The air motor
referenced in this instruction sheet is used with
divorced pumps.
Each motor is pre-lubricated. It requires
no further
lubrication, exceptwhen servicing.
For further information regarding
air motors and
applications with other pump components, see the
instruction sheet supplied with the specific pump.
~
SAFETY PRECAUTIONS
These safety precautions should be followed at all
times.
1. Read all instructions sheets and all explanatory
material before attempting to install, service,
or
operate the system.
2. DO NOT exceed the pressure rating of any com-
ponent in the system.
3. Protect all air, material, and supply lines from
damage
or puncture. Keep all lines and hoses
away from hot machinery, moving parts, and
cramped areas where damage may occur from
flexing
or twisting.
4. Check all hoses
for wear or damage prior to daily
operation. Make sure all connections and fittings
are secure.
5. Shut down the system and relieve all pressures
before servicing any component in the system.
Figure 1: Model 338905
Air Motor
6. Never point the dispensing device
at anyone.
Accidental discharge can result in serious injury.
7. Never install a low-pressure
air hose in any part
of the pump's distribution system.
SPECIFICATIONS
Air lnlet..... .. .. . .. ... .... ............ .... . .. ... .. .... .. . .. .... 1/4" NPSI
Maximum Operational Air Pressure........ .. ......200 psi
....
.... ..................... .. .. ............. .. .. ........ .... ...... .. 13.6 bar
FOR FURTHER SERVICE, CO NT ACT YO UR L OCA L ALEMITE DISTRIBUTION CENTER
A
ALEMITE "
A LEM ITE CORPORATION
167 Roweland D ri ve, Jo hn son City, Te nn esee 37 601
PN. 670654
SER 338905 (10-02)
(8-11)
(7-14)

MAINTENANCE
If the air motor fails to function properly, check for:
• Adequate air pressure
•Worn or damaged parts in air motor
• Drain hole in plungers 321457 clogged
SERVICE
SEPARATE AIR MOTOR FROM PUMP TUBE
(See Figure 2)
The following instructions for separating the air motor
from the pump tube are typical and may not be
complete for any particular pump. Refer to the
instructions supplied with each model for further
information.
CAUTION
Before beginning service or attempting
disassembly of any part, shut off air supply,
reduce material pressure to zero, disconnect air
and material supply lines, and remove pump
assembly from container or system.
1. Clamp the pump assembly into a nondestructive
jaw vise (See Figure 2).
2. Remove cover 321639 from around the pump
tube assembly.
3. Remove 3 screws 171604 and washers 380667
to remove pump tube assembly from air motor
338905.
DISASSEMBLY OF AIR MOTOR
(See Figure 3)
Separate the air motor cylinder 331843-4 from the air
motor body 338906 using the following procedure.
1. Remove screw 170294 and muffler 321085.
2. Unscrew the nuts of compression fitting 328306-
52 and remove tube 331244 with sleeves and
nuts of compression fitting attached to tube.
3. Carefully unscrew and remove cylinder 331843-4
and “O” ring 171003-11 from adapter 321087.
NOTE
Removal of cylinder is often aided by first tapping the
cylinder gently at its threaded end with a nonmetal
mallet. DO NOT use any tool or method to unscrew
cylinder which causes it to distort or go out-of-round.
Use a strap wrench at the top of the cylinder if
removal is difficult.
4. Properly support coupling, then drive roll pin
171032-5 out using a punch of appropriate size.
Remove coupling 321634.
5. Turn the air motor upright. Clamp the air motor
body by the flats. Pull the piston assembly
upward.
6. Hold spacer 320749 at its upper flats (located
under the piston assembly) and unscrew piston
nut 321086. Remove piston 321082 with two
back up washers 131618.
2
Figure 2: Removing Air Motor From Tube Rod Assembly
Air Motor
Non-Destructive Jaw Vice
Air Motor Piston Rod
Washer
380667
Hex Head Screw
171604
Pump Tube Assembly
Cover
321639
SER 338905
Revision (8-11)
(7-14)

SER 338905
Fig 3: Air Motor Assembly
Revision (7-14)
3
D
328306-52
A
331244
331843-4 320727
321086
~
171009-29
' / 131618 - / 171636(4)
6
Qi
321082 c::T/
~
131618
~
/'
330842
320749
ww
v::r---~
320745 12 v. 330843
v~
~
171013-
~
~
. 320736
~
0@@@
/~
/ 17··
..
1003-11
~
398439
<;;:,@)--------------
71
(2)
(1
0-./
320731 ,
---------
-3374
171006-15
320748
314671
314670(See
Figure
3A)
' -
~
.0
"--
---------
171
000-14
(2)
O
IJJL
\~
~~
~~i(;~(2)
.
~
320737
(2)
321087 /
~
-
~
l------_
338906
320746
314670
~
~
.,..{liJ
---
310011
171009-41
~
/~')
_,
o
~<J::;,
-
CS'r;::,
328306-52
~
321085
~
170292
~
171000-17
310011 (See
•O / Figure 3A)
@/q;:(
310010
~
~
;;:;)
(
171032
-
5
Figure
3A:
"
V"
packing orientation
331342
~
~
~
(
321633~
/~
321634
(7-14)

7. Hold piston rod 320746 at its bottom flats and
unscrew spacer 320749 from the piston rod.
8. Pull piston rod down and out of air motor body
338906.
9. Unscrew inlet body 320727. Remove “O” ring
171009-29.
10. Unscrew two toggle caps 337471. Remove
springs 317524 and “O” rings 171000-14.
11. Slide plungers 321457 and toggles 320737 out of
shuttle 320736 and remove shuttle.
12. Unclamp and turn the air motor to the horizontal.
Clamp the air motor body, with the inlet body
opening face up.
13. Through the air-inlet body opening, unscrew four
screws 171636. Lift out valve retaining spring
330842, slide valve 320726, valve retainer
330843, valve seat 320730, and gasket 320731.
NOTE
Inspect slide valve and seat (part of 398439) for any
scoring or damage. They must be replaced if there is
any damage.
14. Remove retaining ring 171006-15, brass washer
320748, leather washer 314671 and block “V”
packing 314670, from inside of packing nut at top
of the air motor base
NOTE
Packing nut 320745 is staked in place and should not
be removed unless damaged. If the retaining ring is
damaged, order either the packing nut 320745 or the
entire air-motor base assembly (See Figure 3). This
part must be staked into position when reassembled.
15. Remove retainer 321633, adapter 331342,
washer 310010, v-packing 310011, and o-ring
171000-17 from the air-motor base.
16. Inspect the body 338906 for excessive rust or
damage. If this part must be replaced, it can be
removed from adapter 321087. The two parts are
sealed together with o-ring 171009-41, then
staked together. The parts must be staked into
position after reassembly.
17. Clean all parts and inspect for wear or damage.
CAUTION
Worn or damaged motor and pump parts can
cause injury to personnel and damage to
property. REPLACE any worn or damaged parts.
If using an Alemite repair kit, use all replacement
parts in kit.
REASSEMBLY OF AIR MOTOR
1. Before reassembling the air motor, lubricate
parts as noted in the following instructions:
a. Lubricate all “O” rings, seals, and packings
with oil.
b. Brush a coat of grease containing molybde-
num (moly) in toggle sockets of shuttle
320736 and plungers 321457, inside bore of
shuttle, outside diameter of plungers, and on
slide valve 320726.
c. Dip gasket 320731 and springs 317524 in
Lubriplate #1550 lubricant.
d. Coat the bore of cylinder 331843-4 and out-
side diameter of piston 321082 with the mix-
ture outlined in step 1c.
e. Soak leather washer 314671 in SAE No. 30
oil for a minimum of eight hours.
2. Before reassembly of the air motor, reassemble
all parts that must be staked into position, as
noted in the following instructions:
a. Packing nut 320745 is sealed to the top of
body 338906 with o-ring 171013-12. Stake
the packing nut to the body.
b. Body 338906 and adapter 321087 are
sealed together with o-ring 171009-41. Stake
the adapter to the body.
3. Position block “V” packing 314670, leather
washer 314671, and brass washer 320748 into
packing nut. Secure with retaining ring 171006-
15 (See Figure 3a).
NOTE
The open end of the “V”, from block “V” packing
314670 must face the bottom of air motor base.
(Step 3).
4. Slide washer 310010 into adapter 331342. Slide
v-packing 310011 into adapter.
NOTE
The open end of the “V”, from block “V” packing
310011 must face the top of air motor base. (Step 4).
5. Slide adapter 331342 into the air-motor base.
6. Place gasket 320731, valve seat 320730, valve
retainer 330842, slide valve 320726, and valve
retaining spring 330842 into air motor base.
Secure with four screws 171636.
4
Revision (8-11)
SER 338905
®
(7-14)

NOTE
Tighten screws 171636 evenly, then torque
alternately (crisscross) to 25-30 inch lbs. (75-90 Nm).
Retorque to ensure the same torque on all screws.
Valve should move from one position to the other
with a force of 12 to 14 ozs. (340 to 396 Grams).
Force must be applied in the same direction as the
shuttle applies force in normal operation. Adjust
spring to meet load if necessary.
7. Position shuttle 320736 in the air inlet body
opening. The end of the shuttle a with large
opening must face the top of the air motor, and
the flat side must be facing valve retaining spring
330842.
8. Holding one toggle 320737 with pliers, insert it
through the toggle-cap opening in the side of the
air motor base. Slide it into the socket in shuttle
320736. Repeat for the other toggle.
9. Insert piston rod 320746 into lower end of air
motor base, through the shuttle and packing nut.
CAUTION
Insert piston rod 320746 into the air motor base
before inserting the seals. Inserting the seals
before the piston rod damages the seals and
causes the pump to leak.
10. Apply Loctite 242 to the threads at the top of
the piston rod and slide spacer 320749 over
piston rod end. Feed rod through packing and
into the upper end of the shuttle. Hold the pis-
ton rod at the bottom flats and screw the spacer
onto the piston rod as far as it will go.
11. Place first washer 131618, packing 321082, and
second washer 131618 onto piston rod and
spacer.
12. Screw piston nut 321086 onto piston rod. Torque
to 10 ft.-lbs. Rotate spacer counterclockwise until
it is secure against the piston nut. Torque to 20
ft.-lbs.
13. Install plungers 321457 onto toggles, with the
drain holes on the bottom. Insert springs 317524
into the plungers and slide “O” rings 171000-14
over the ends of toggle caps 337471. Screw tog-
gle caps into place by hand.
CAUTION
If the toggle cap is not centered when tightened,
applying force will break toggle. If difficulty is
encountered while tightening toggle caps by
hand, loosen toggle cap, reposition, and
retighten. Final tightening of cap should be done
carefully.
14. Pack approximately 1/4 oz. (7.08 Grams) of Lubri-
plate #1550 lubricant into the air-motor valve
cavity. Install “O” ring 171009-29 onto air inlet
body 320727. Install air inlet body into air motor
base.
15 Position “O” ring 171003-11 onto air-motor base
and screw cylinder 331843-4 onto air motor.
16. Install retainer 321633.
17. Install coupling 321634 onto the piston rod.
Press roll pin 171032-5 into piston rod.
18. Reconnect tube 331244 and tighten the nuts of
compression fittings 328306-52.
19. Air motor is now ready for reattachment to the
tube pump.
NOTE
The parts listed in this instruction sheet are for
reference identification in the instructions and
illustrations. Some are not available as separate
parts and are noted in the parts list. Standard items
(such as nuts, bolts, etc.) should be purchased at a
hardware store. Refer to the current parts price list
and bulletins before ordering parts, and always give
the part number, quantity, description, and model (if
available) when ordering parts. Parts availability and
prices are subject to change without notice.
5
SER 338905
Revision (8-11)
®
®
®
(7-14)

6
SER 338905
Revision (7-14)
@(2)
@(2)---~~
1t NPSI
SECTION AA
Figure 4: Cross Section
d
34
Revision (8-11)
SER 338905
(7-14)

 398653-4 Major repair kit for air motor 338905
 393124 - Cylinder and tube conversion kit
 Part of slide valve and seat kit 398439
+ Not Available as a separate purchased part
Item Part No Description Qty
1 131618 BACK UP WASHER, 2 15/16” O.D. (Zinc-Plated Steel) 2
2 170292 PAN HEAD MACHINE SCREW, 8-32 X 1” 1
3 171000-14 “O” RING, 3/4” I.D. X 15/16” O.D. 2
4 171000-17 “O” RING, 7/8” I.D. X 1 1/8” O.D. 1
5 171003-11 “O” RING, 2-7/8” I.D. X 3-1/8” O.D. 1
6 171006-15 STEEL RETAINING RING, 7/8” Diameter (Internal) 1
7 171009-29 “O” RING, 1-9/16” I.D. X 1 3/4” O.D. 1
8 171009-41 “O” RING, 2-5/16” I.D. X 2-1/2” O.D. 1
9 171013-12 “O” RING, 1-1/8” I.D. X 1-1/4” O.D. 1
10 171032-5 ROLL PIN, 3/32” Diameter X 1/2” Long 1
11 171636 HEX-HEAD CAP SCREW, 10-32 X 3/8” Long 4
12 310010 LEATHER WASHER, 11/16” O.D. 1
13 310011 BLOCK “V” PACKING, 47/64” O.D. 1
14 314670 BLOCK “V” PACKING, 3/4” O.D. 1
15 314671 LEATHER WASHER, 3/4” O.D. 1
16 317524 SPRING, 1-7/16” Long - 14 Coils 2
17 320727 INLET BODY, 1-15/16” O.D. (Zinc-Plated Steel) 1
18 320731 GASKET, 1” O.D. (Rubber-Coated Fabric) 1
19 320736 SHUTTLE (Steel) 1
20 320737 TOGGLE (Steel) 2
21 320745 PACKING NUT (Zinc-Plated Steel) 1
22 320746 PISTON ROD. 9-3/8” Long 1
23 320748 WASHER, 33/64” I.D. X 7/8” O.D. (Brass) 1
24 320749 SPACER, 3-11/64” Long (Chrome-Plated Steel) 1
25 321082 PISTON, 3-1/32” O.D. (Rubber) 1
26 321085 MUFFLER 1
27 321086 PISTON NUT, 3/8-24 UNF-2B (Zinc-Plated Steel) 1
28 321087 ADAPTER, (Zinc-Plated Steel) 1
29 321457 PLUNGER, 9/16” O.D. (Steel) 2
30 321633 RETAINER, ( Stainless Steel) 1
31 321634 COUPLING, 31/32” Long (Zinc-Plated Steel) 1
32 328306-52 COMPRESSION FITTING for 5/16” Tubing 2
33 330842 VALVE RETAINING SPRING (Beryllium Copper) 1
34 330843 VALVE RETAINER, 1-11/16” O.D. (Spring Steel) 1
35 331244 TUBE, 5/16” O.D. (Zinc-Plated Steel) 1
36 331342 ADAPTER, 1-3/8” Long X 1-1/8” O.D. 1
37 331843-4 CYLINDER, 3-13/16” Long 1
38 337471 TOGGLE CAP, 1-5/8” Long (Zinc-Plated Steel) 2
39 338906 BODY, 6-21/32” Long (Zinc-Plated Steel) 1
40 398439 SLIDE VALVE AND SEAT KIT 1
7
PARTS LIST - Model 338905 Air Motor
SER 338905
Revision (8-11)
Loctite and 242 are trademarks of Henkel Corporation in the U.S. and eleswhere.
denotes a trademark registered in the U.S. Patent and
Trademark Office.
®
Lubriplate is a trademark of Fiske Brothers Refining Co.
(7-14)

NOTES:
CHANGES SINCE LAST PRINTING
Added Compng 328306-52
8
Revision (8-11)
SER 338905
321633 Retainer Change
(7-14)