© Titan Tool Inc. All rights reserved. 17
Air Motor Service Procedure
This Air Motor requires a normal mantenance inspection at 1500
hours of service on the non-circulating models and 800 hours of
service on the circulating models. Service procedure includes
replacement of the Motor Service Kit, Minor Part # 850-050 listed
below. It is suggested that one Motor Service Kit, Major Part
# 850-550 (which includes the minor kit) be kept on hand for
normal maintenance and emergency repairs.
Maintenance
The 850 Series Air Motor should be served with moisture-free
air. A water trap, Titan Part #141-057, is recommended. For use
under very cold and humid conditions a moisture separator and
an automatic oiler may be necessary to avoid icing.
Disassembly Procedure
1. Disconnect air hose from elbow (1).
2. Remove locking bolts and nuts (15, 16), trip spring
retainers (12), O-rings (11), trip springs (10), and balls (9)
from both sides of the cylinder head (5).
3. Disconnect air line (4) from adaptors (3) top and bottom.
4. Remove eight nuts (40) and eight bolts (2).
5. With piston (29) in down position, place wrench on ats
of piston rod (32) and disconnect piston rod from pump
connecting rod.
6. With piston (29) at top of stroke, raise cylinder head (5)
and remove retainer (25). Lift off cylinder head (5). Valve
sleeve (13) may pull out of cylinder head. If so, lift valve
sleeve off separately.
7. Remove stop nut (17) and then unthread upper valve
keeper (18).
8. Remove air valve (19) followed by lower valve keeper (21)
and bushing (22).
9. If valve sleeve (13) is still in cylinder head, leave it there
unless it is necessary to change O-rings. To remove, use
Sleeve Removal Tool Part # 900-021 to remove sleeve
(13).
10. Remove cylinder (34).
11. Remove piston rod (32) and piston (29) from motor base
(37).
12. Secure piston (29) in vise and remove piston nut (26) and
piston washer (27).
IMPORTANT: Do not clamp on O.D. of the piston.
13. Remove valve rod assembly (28) and valve trip collar (31).
14. Unscrew piston rod (32) from piston (29).
15. Remove O-ring (30) from piston (29).
16. Remove O-rings (23, 24) from bushing (22), O-ring (35)
and wear ring (36) from motor base (37).
Reassembly Procedure
Wash all replaceable parts thoroughly with kerosene and
lubricate with Lubri-Plate or similar non-water soluble grease.
For routine servicing, use new parts from the Air Motor Servic
Kit Part # 850-500. Inspect all other parts for abnormal wear or
damage and replace if necessary.
1. Install new O-ring (35) and new wear ring (36) into motor
base (37) and new O-rings (23, 24) into bushing (22). Use
care to avoid damaging O-rings and make sure they are
properly seated in the O-ring grooves.
2. Place valve trip collar (31) into piston rod (32) followed by
valve rod assembly (28).
3. Screw piston rod (32) into piston (29). Replace piston nut
and washer (26, 27).
4. Install new piston O-ring (30) into piston (29).
5. Place new gasket (33) into position in motor base (37).
6. Place piston assembly (29, 32) into motor base (37). Do
not damage O-ring.
7. Place new O-rings (20) on air valve (19).
8. Mount air valve assembly onto valve rod (29) by placing
bushing (22) over valve rod (28), followed by keeper (21),
air valve (19) and upper valve keeper (18). Thread upper
valve keeper (18) down on air valve hand tight. Then
loosen approximately 1/4 turn. Place wrench on ats of
valve rod (28) and hold to prevent valve rod (28) from
turning. Thread stop nut (17) down on valve rod (28) to
lock upper valve keeper (18) in position. Be sre upper
valve keeper (18) does not change position.
9. Grease inside of cylinder (34) and work cylinder down
over piston gently in order to avoid damage to piston
O-ring (30).
10. Install new O-rings (14) on valve sleeve (13). Grease
valve sleeve and install into cylinder head (5) so large
holes in sleeve line up with trip retainer holes in cylinder
head (5). Put one trip retainer (12) with new O-ring (11)
into cylinder head without ball (9) or spring (10) and hold
in position temporarily with locking bolt (16) and nut (15).
11. Place new gasket (33) into position in cylinder head (5)
and hold with gasket cement or grease.
12. Carefully position air valve assembly up into cylinder head
(5).
13. Push bushing (22) up into bottom of cylinder head (5) to
sufciently permit installation of retainer (25).
14. To install trip spring retainer be sure one of the detents
of valve (19) is properly lined up with hole in the cylinder
head (5). Place new trip spring retainer O-ring (11) onto
remaining trip spring retainer (12). Install new ball (9)
followed by trip spring (10) and trip spring retainer (12) into
hole of cylinder head (5). Lock into position with bolt (16)
and nut (15).
15. For opposite trip spring retainer (12) replacement, repeat
step #14.
16. Connect air line (4) to adapters (3) top and bottom.
17. Replace bolts (2) and nuts (40). Always tighten nuts
180 degrees apart in order to obtain proper and even
compression.
18. Place wrench on the ats of piston rod (32) and connect
pump connecting rod.
19. Reconnect air hose to elbow (1).
Service Kits
Part No. Description
743-012 Valve rod and spring assembly
Includes items 17, 28 and 31
850-050 Motor service kit, minor
Includes items 9-11, 14, 17, 20, 23-24. 30, 33, 35-
36.
850-500 Motor service kit, major
Includes minor service kit 850-050, and items 13,
18-19, 21, 28 and 31.
742-942 Air line assembly
Includes item 4, and compression nut, part #
742-009 and ferrule, part # 742-010 (each is a
component of item 3, adapter part # 742-007).
