7 / 14
9. Place the seal in the housing (34) O ring first with the
grooves facing outwards. Press the seal in making sure it is
seated fully in the housing.
10. Replace the Air motor and shaft assembly in reverse order.
31-418 AIR MOTOR REPLACEMENT OF
PARTS (FOR QS-5012-1-CE)
1. Remove the end cap (36) or (64) for QMS-430-CE.
2. Remove dead end plate bolts (39).
3. Remove dead end plate (40). Use a puller, do not use
screwdriver to remove the end plate.)
4. Remove the dowel pins (42) from the body and push back
into end plate (40) until flush or just below the machined
surface of the dead end plate. Remove rotor (45) using an
arbor press.
5. Remove vanes (44).
6. Remove shaft seal (48) and bearing (47) or (38) from drive
end plate (46) and bearing (38) from dead end plate (40).
Do Not remove drive end plate bolts or drive end plate
(46).
7. Clean parts. Check for scoring on the end plates and rotor
assembly. If scoring exists, send unit to a Gast Authorized
Service Facility.
8. Check the bearings for signs of wear. Replace the bearings
at least every 2 years.
9. Place the drive shaft of the rotor assembly (45) through the
drive end plate (46). Press the drive bearing (47) onto the
drive shaft using a bearing pusher.
10. Using a suitable tool, lightly tap on inner race of the drive
end bearing (47) to snug up rotor (45) to drive end plate
(46).
11. Check the vanes (44) for wear. If the height of the vanes
are less than 17.5mm (11/16”) then re-new the vanes.
Install new vanes (44), the angle cuts on the vane face to
the center of the rotor.
12. Place the end plate gasket (41) on the body of dead end
(40). If the original is damaged, replace with a new one
supplied in the service kit.
13. Place the dead end plate (40) on the body.
14. Install the dead end bearing (38) and press into place with
bearing pusher tool.
15. Install the dowel pins (42).
16. Fully tighten the remaining bolts to 8.5 - 11.3 Nm (75-100
in-lbs).
17. Set end clearance to the values at the end of this section.
Lightly tap on the inner race of the dead end bearing to
free up and center the rotor in the body.
18. Apply a small amount of grease to bearing seal (48) and
install the drive end bearing seal by pressing flush with
bearing pushing tool from Tool Kit.
19. Reattach end cap (36) or (64) with new gasket ((37).
20. Apply a few drops of 10w oil lubricant into ports and
rotate shaft by hand for a few rotations.
END CLEARANCES
Total clearance: .063mm (0.0025”)
Top end clearance: .038mm (0.0015”)
31-418 AIR MOTOR PARTS LIST
Ref.
No.
Replacement
Part No.
Description
Ind.
Parts
Req'd.
36 QS-190 DEAD END CAP 1
37 --- END CAP GASKET 1
38 PT-58 BEARING 1
39 Purchase Locally MACHINE SCREW, 1/4-28 X 1/2 6
40 --- DEAD END PLATE 1
● 41
PT-59-1 GASKET, RED (.002") 2
42 31-419-K10 DOWEL PIN (Kit of 10) 1
43 --- BODY 1
● 44
--- VANE 4
45 31-429 ROTOR ASSEMBLY 1
46 --- DRIVE END PLATE 1
47 31-421 BEARING 1
48 31-420 SEAL 1
49 31-430 KEY, 3/16" SQUARE 1
50 Purchase Locally MACHINE SCREW, 1/4-28 X 5/8 6
51 Purchase Locally BOLT, 3/8-16 X 3/4" Long 4
52 Purchase Locally LOCK WASHER, 3/8" 4
53 350-401 MUFFLER 1
● Parts included in KK-5001-1 Air Motor Repair Kit.
53
37
42
38
36
39
40
41
43
45
44
41
47
50
48
52
51
46
49
FIG. 4
31-418 AIR MOTOR
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