SKF Lincoln B Series Instruction Manual

User and maintenance instructions
Models , , , , series “B”
 /, ,  and  in
Air motors with air brake
Date of issue January 2018
Form number 404239
Version 2

Contents
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Explanation of signal words for safety . . 
Dimensions . . . . . . . . . . . . . . . . . . . . . . . 
Specifications . . . . . . . . . . . . . . . . . . . . . 
Before connecting air motor to
air line. . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Operating precautions . . . . . . . . . . . . . 6
Attach air motor to pump tube . . . . . . 6
Service and disassembly procedure . . 6
Power valve . . . . . . . . . . . . . . . . . . . . . . 6
Air brake assembly . . . . . . . . . . . . . . . . 7
Labyrinth sub-assembly
disassembly procedure. . . . . . . . . . . . . 7
Labyrinth sub-assembly
reassembly procedure . . . . . . . . . . . . . 8
Cylinder tube and muffler . . . . . . . . . . 8
Setting air brake trip speed. . . . . . . . . 9
Air brake operation. . . . . . . . . . . . . . . . 9
Setting air brake trip speed. . . . . . . . . 9
Speed settings . . . . . . . . . . . . . . . . . . . . 
Cavitation . . . . . . . . . . . . . . . . . . . . . . . . 
Broken hose or fitting . . . . . . . . . . . . . . . 
Increase in air pressure. . . . . . . . . . . . . . 
Increase in demand . . . . . . . . . . . . . . . . 
Resetting air brake after tripping . . . . . . 
Exploded views . . . . . . . . . . . . . . . . . . . 11
Service parts list . . . . . . . . . . . . . . . . . . 16
Troubleshooting . . . . . . . . . . . . . . . . . . 19
Warranty . . . . . . . . . . . . . . . . . . . . . . . . 20
Safety
Read and carefully observe operating
instructions before unpacking and operating
air motor. Air motor must be operated,
maintained and repaired exclusively by
persons familiar with operating instructions.
Local safety regulations regarding
installation, operation and maintenance
must be followed.
Operate pump only after safety
instructions and this service manual are fully
understood.
Explanation of signal
words for safety
NOTE
Emphasizes useful hints and recommenda-
tions as well as information for efficient and
trouble-free operation.
CAUTION
Indicates dangerous situation that can lead to
light personal injury or property damage if
precautionary measures are ignored.
WARNING
Indicates dangerous situation that can lead to
severe or light personal injury if precaution-
ary measures are ignored.
DANGER
Indicates dangerous situation that can lead to
death or severe personal injury if precaution-
ary measures are ignored.
NOTE
Model shown with optional tamper
resistant kit installed over air brake
selector knob.


Specifications
Model
Cylinder
diameter
Effective
piston area
Operating pressure
range
Operating
temperature range
Minimum I.D.
of air supply
Air
Inlet
Air cons. at
 psi ( bar)
  in (254 mm)  in( cm)– psi (3,4–7 bar) – to  °F
(–34 to 66 °C)
3/4in (20 mm) 3/4in NPTF . scf/cycle
(103 L(N)/cycle)
  in ( mm)  in( cm)– psi (3,4–7 bar) – to  °F
(–34 to 66 °C)
3/4in (20 mm) 3/4in NPTF . scf/cycle
(75 L(N)/cycle)
  in ( mm)  in( cm)– psi (2,7–7 bar) – to  °F
(–34 to 66 °C)
1/2in (12 mm) 3/4in NPTF . scf/cycle
(46 L(N)/cycle)
  1/4in
( mm)
 in( cm)– psi (2,7–14 bar) – to  °F
(–34 to 66 °C)
1/2in (12 mm) 1/2in NPTF . scf/cycle
(32 L(N)/cycle)
Model
Maximum
recomended speed
Effective
piston area Weight
Seals
material Dimension “A” Dimension “B” Dimension “C”
  cpm )  in (152 mm)  lbs. (28,1 kg) Buna-N and
Teflon )
 1/4in
(337 mm)
 1/16 in
(332 mm)
 3/4in
(577 mm)
  cpm )  in (152 mm)  lbs. (21,2 kg) Buna-N and
Teflon )
 1/4in
(286 mm)
 in
(279 mm)
 3/4in
(577 mm)
  cpm )  in (152 mm)  lbs. (15,5 kg) Buna-N and
Teflon )
 1/4in
(235 mm)
 11/16 in
(271 mm)
 3/4in
(577 mm)
  cpm )  in (152 mm)  lbs. (11,7 kg) Buna-N and
Teflon )
 1/2in
(191 mm)
 11/16 in
(221 mm)
 5/8in
(599 mm)
C
1)
/ -20
12
4 in
(101 mm)
4 in
(101 mm)
B
A
WARNING
Do not exceed stated maximum working
pressure of air motor or lowest rated
component in your system.
Do not alter or modify any part of
equipment.
Do not operate equipment with combus-
tible gas.
Do not attempt to repair or disassemble
equipment while system is pressurized.
Tighten all fluid connections securely
before using equipment.
Always read and follow fluid
manufacturer’s recommendations
regarding fluid compatibility, and use of pro-
tective clothing and equipment.
Check all equipment regularly and
repair or replace worn or damaged parts
immediately.
Failure to heed warnings including misuse,
over pressurizing, modifying parts, using
incompatible chemicals and fluids, or using
worn or damaged parts, may result in seri-
ous personal injury and/or damage to equip-
ment, fire, explosion, or property damage.
) Air inlet.
Fig. 1
Dimensions
) . cpm with air brake engaged.
) Teflon seals used with power valve spool (13) and relay valve (17).
NOTE
Do not operate with air contaminated with
materials that are not compatible with
Buna-N seals. Use only with
 in (152 mm) stroke pump tubes.


Fig. 8
Air pump repair kit (92)
55
56
62
63
64
65
Service assemblies
and kits
32
32
60
59
58
57
61
40
50
51
52
53
62
63
89
90
Fig. 2
Air brake subassembly 85317
Fig. 3
Relay valve (17)
Fig. 4
Signal valve cap kit (31)
Fig. 5
Air signal valve (20)
Fig. 6
Trip indicator (48)
Fig. 7
Stop valve repait kit (91)
Fig. 9
Bleed assembly (67)
Fig. IPB1
Gasket and air filter (89) and gasket plate
and check valves (90)
NOTE
Air brake assembly does not fit 
 in (76 mm) series III air motor.
NOTE
Soft parts kit  available for repair of air
brake subassembly. Refer to page 16 for
details.


NOTE
When replacing soft parts, replace all parts
included in soft parts kit.
Fig. 10
Muffler with gasket 242788
Fig. 11
Power valve subassembly 244800,
244804, 244806 and 244808
Fig. 12
Power valve spool and body 244802
NOTE
Muffler element kit  available for repair
of muffler (includes element, felts and
gasket).
NOTE
Cylinder tube soft parts kit 
( in airmotor),  ( in airmotor), 
( in airmotor), or  ( 1/4in airmotor).
NOTE
Soft parts kit  available for repair of
power valve subassembly.


Before connecting air
motor to air line
Lincoln series III air motors are fully
pneumatic and require minimum specified
size of air supply hose for proper operation.
Check specifications for minimum ID of air
supply hose, corresponding sizes of air
controls and accessories that allow
nonrestrictive air flow. Lincoln filter,
regulator with gauge and lubricators are
available as combination units (FRL).
It is recommended to use a  micron
minimum pneumatic filter and pressure
regulator with this system.
Special lubricant is used in assembly of air
motors. It is not recommended to lubricate
system after it has been installed. New
lubricant will wash away factory lubricant
and may result in air motor failing. Added
lubrication could also result in critical small
pneumatic paths being blocked resulting in
malfunction.
For 1/2in (13 mm) air line -
Model -
For 3/4in (19 mm) air line -
Model -
If quick disconnect coupling should be
used, install supplied coupler to ensure
proper air motor operation.
Operating precautions
Use Lincoln replacement parts to assure
compatible pressure rating.
Heed all warnings.
Do not operate air motor in excess of
recommended pressure range.
Disconnect air line and relieve (vent)
pressure before servicing and when idling air
motor for long periods of time.
Service and
disassembly
procedure
Attach air motor to
pump tube
1 Tightly attach tie rods (41) to air motor
lower casting. Use short threaded end of
tie rods.
2 Mount air motor to top of pump tube
outlet and tightly connect coupling nut to
air motor piston rod (5, 36 and 72).
3 Attach tie rods to pump tube with four
nuts (42). Leave nuts loose.
4 Connect air supply.
5 Slowly cycle pump several times using
only enough air pressure to operate pump
without pump stalling.
6 Stop pump on up stroke and tighten four
nuts (42) to securely fasten air motor to
pump tube.
Modular design of air motor and accessibility
of vital operation parts make service
available without taking air motor out of line
or without complete disassembly.
Power valve
1 Remove four screws (27 and 34).
2 Remove end caps (10 and 14).
3 Push out valve spool (13).
4 Remove spool bumpers (9).
5 Remove o-ring (11).
6 Remove four screws (37) and lift
valve body (12).
7 Remove gasket (15) to complete valve
disassembly.
8 To reassemble, reverse procedure.
WARNING
Do not alter or modify any part of equip-
ment. Always check equipment for proper
operation before each use. Verify safety
devices are in place and operating properly.
Failure to comply may result in death or
serious injury.
NOTE
Ground air motor according to local codes
when flammable materials are pumped.
WARNING
Always disconnect air supply and relieve
pressure before checking, servicing or repair-
ing any part of air motor.
Failure to comply may result in death or
serious injury.
WARNING
Never exceed maximum air or fluid working
pressure of lowest rated system component.
Failure to comply may result in serious
bodily injury and/or property damage.
WARNING
Always read and follow fluid and solvent
manufacturer’s recommendations in regards
to use of protective clothing and equipment.
Failure to comply may result in death or
serious injury.


Air brake
sub-assembly
1 Remove four screws (23) (two on each
end) and pull out air brake subassembly.
2 Remove two screws (39) and lift out
valve body (17).
3 Remove four screws (32) with (two on
each side of air brake) and remove signal
valve caps (31) and air signal valves (20).
4 Remove four (4) screws (80) to remove
labyrinth sub-assembly from air brake.
5 Remove four screws (24) and lift off
upper body (50) and upper gasket (51).
6 Remove gasket plate (52) and
lower gasket (53).
7 Remove air filter (40) in two locations.
8 Remove pump sleeve (56)
and piston (55).
9 Remove diaphragm seal and retainer,
diaphragm, spring and stop valve
assembly (61, 57, 58, 59 and 60).
10 Remove trip indicator (48).
11 To re-assemble, reverse disassembly
procedure with the following
precautions:
11.1 Upper and lower gaskets (51 and
53) should be coated with film of
light oil (SAE ) before assembly.
11.2 When new umbrella valves (63)
are installed, note gasket plate
(52) has a circle and an Xstamped
into both sides. Umbrella valve
is installed into plate from circle
side of plate. One umbrella valve
should be installed into each side
of plate so that valve is within
circle and stub end protrudes
through X.
11.3 After installing umbrella valve
(63), long rubber stem of valve is
to be removed, leaving rubber ball
end intact to secure valve to plate.
11.4 When installing pump sleeve (56)
into lower body (54), sleeve should
be placed into lower body as
shown in Fig. 4. When properly
installed moulded pin protruding
from pump sleeve will fit into
mating hole in gasket (53) and
gasket can then be installed
properly over pins, (66). If sleeve is
not properly aligned as shown, air
brake cannot be assembled
properly.
Labyrinth
sub-assembly
disassembly
procedure
1 Remove four screws (80) from face of
labyrinth sub-assembly to remove
labyrinth from air brake assembly.
2 Remove screw (88) to remove cover (87)
over selector knob if so equipped.
3 Remove selector bolt (86) and washers
(85) to remove selector knob. Use caution
when removing selector knob from
labyrinth assembly, pin (82), spring (83),
and  balls (81) are retained by selector
knob and could be lost.
4 Remove gasket (74) from backside of
labyrinth sub-assembly.
5 Remove six screws (73) from backside of
labyrinth sub-assembly.
6 Separate labyrinth sub-base (75) from
labyrinth cover (78) exposing labyrinth
plate and gasket.
7 Remove gasket (76) and plastic
laminated labyrinth (77).
8 Remove seven o-rings (79) from
labyrinth cover (78).


Cylinder tube and
muffler
1 Remove air brakes subassembly
(Air brake subassembly, page 7).
2 Remove two screws (30) and pull off
muffler (29).
3 Remove gasket (28).
4 Remove four nuts (26).
5 Lift upward and remove
upper casting (8).
6 Remove four tie rods (25).
7 Remove air tube (7).
8 Lift upward and remove cylinder tube (6).
9 Remove piston and piston rod (5).
10 Remove four connecting rods (41).
11 Reverse procedure to reassemble.
Labyrinth
sub-assembly
re-assembly
procedure
Follow reverse directions of disassembly
procedure with the following precautions to
reassemle labyrinth subassembly:
1 Ensure plastic laminated labyrinth (77) is
in good condition before re-assembly.
Clear plastic laminate should be in good
condition without any tears or indications
of separation from brass labyrinth plate
inside. Inspect labyrinth plate for any signs
of blockage including, but not limited to,
dirt, grease, oil or water that should be
visible through clear laminating material.
2 Keep all labyrinth components clean and
free of grease, oil and dirt, except as
noted.
3 Very light coating of grease may be used
to retain balls (79) in place when installing
selector knob (84).
4 Install six screws (73) but do not tighten
when reassembling labyrinth sandwich.
Install selector knob (84) and selector bolt
(86) before tightening six screws (73).
Tighten six screws (73) to  in.lbf
(1,4 Nm). Tighten selector bolt (86) to
 in.lbf (5,6 Nm).
5 Use four screws (80) and tighten to
 in.lbf (1,4 Nm) when installing labyrinth
sub-assembly onto air brake assembly.
6 Do not cut or trim clear laminate plastic
from labyrinth assembly.
NOTE
Align two holes on cylinder tube (6) with two
holes on air brake subassembly before tight-
ening tie rods (25) so that proper seal with
o-rings is achieved.


Setting air brake trip
speed
Selecting speed range letter other than
bypass will activate air brake. Air brake will
stop air motor from operating if threshold
speed setting is exceeded. Air motor will not
restart until intentionally reset. Cause of
pump overrun may be anything that will
allow pump to run faster than normal such
as, but not limited to the following:
Cavitation
Low fluid levels will allow pump to cavitate.
Pump will try to pump air instead of fluid into
fluid lines.
Broken hose or fitting
Broken hose or fitting will cause loss in fluid
pressure allowing pump to run faster than
normal.
Setting speed
1 Remove selector cover (87) by removing
screw (88) to gain access to selector
knob (84).
2 Select bypass mode by positioning
selector knob pointer (small round hole
in face of selector knob) to face of
labyrinth cover (78).
3 Determine speed of pump by counting
number of strokes pump makes per
minute with pump and air motor
operating normally.
4 After determining normal operating
speed of pump and air motor, consult
setting legend on face of labyrinth
cover (78), and find speed range closest
to normal operating speed of air motor.
5 To allow for normal fluctuation in
operating speed of air motor and pump,
set selector knob to next highest speed
setting.
6 Test pump in operation to make sure it is
operating properly before leaving
pumping system unattended.
Speed settings
Bypass air brake. In bypass mode air
brake does not provide any protection to
pump or air motor. Air motor will
continue to run at any speed.
See Fig. 13.
1  to  cycles/minute, air brake will trip
turning off air motor when air motor
speed reaches speed of
 to  cycles/minute.
2  to  cycles/minute, air brake will trip
turning off air motor when air motor
speed reaches speed of
 to  cycles/minute.
3  to  cycles/minute, air brake will trip
turning off air motor when air motor
speed reaches speed of
 to  cycles/minute.
4  to  cycles/minute, air brake will trip
turning off air motor when air motor
speed reaches speed of
 to  cycles/minute.
5  to  cycles/minute, air brake will trip
turning off air motor when air motor
speed reaches speed of
 to  cycles/minute.
6  to  cycles/minute, air brake will trip
turning off air motor when air motor
speed reaches speed of
 to  cycles/minute.
1)
2)
Air brake operation
NOTE
Speed settings are not precision speed con-
trol settings for air motor. All speed settings
are approximate and are not intended for use
in precisely controlling speed of pump/pump
tube combination. Precision control of pump
operating speed is beyond scope of device.
NOTE
Operating air motor at speeds greater than
 cycles/minute is not recommended with
air brake engaged. Operation at speeds
greater than  cycles/minute will cause no
harm to air brake, but may exceed limitations
of timing circuit in air brake causing air brake
to trip without apparent cause.
Fig. 13
) Speed setting legend.
) Speed setting dial.
NOTE
Always shut off air supply before servicing air
motor. Air motor in tripped condition is under
pressure and may restart unexpectedly for
one or two cycles.


1) 2)
1)
Increase in air pressure
May be caused by air supply system that is
inadequate for application to rise as other
plant equipment is shut down. This causes
more air available to operate pump with.
Unauthorized tampering with air pressure
regulator may also be cause.
Increase in demand
Fluid demand may be greater than expected.
Tripped condition can be determined if air
motor has stopped, red/orange indicator pin
will be out (Fig. 14, page 10), pump rod will
be in down position and air will be heard
venting from vent hole in lower body of air
brake (Fig. 16).
Before resetting, cause of overrun should
be determined if possible before restarting
pump. Check for low fluid levels, broken hose
or fitting connections before restarting. If
cause cannot be determined without
starting pump, pump may be cautiously
restarted and observed for any indications of
problem before resuming normal operation.
Resetting air brake after
tripping
1 Turn off air supply to air motor.
2 Press flush reset button (located on right
side of relay valve (17) with screwdriver or
other suitable object, (Fig. 15), until air
motor shifts and Indicator pin (48)retracts
into air brake. Hold reset button until all
air has been vented from air motor
(On large air motors this may take several
seconds). Otherwise wait until all air has
been vented before attempting restart.
3 Turn on air supply and air motor
will restart.
4 Air brake may trip again very quickly if
cause of air brake trip is cavitation or
broken fluid line
5 Use bypass setting to prevent unnecessary
tripping of air brake when in process of
setting up system and determining speed
of pump/pump tube system or when
trouble shooting system. Be sure to
reactivate air brake by resetting to desired
run setting before leaving pump system
unattended.
1)
Fig. 14
) Run position.
) Tripped condition (extended).
) Flush reset button.
) Vent hole.
Fig. 15
Fig. 16
Rear view of air brake


27
10
9
13
11
12
15
11
14
28
30
3)
34
16
29
44
38
3
21
4
25
43
46
45
47
5
6
7
41
4
3
22
1
42
2
47
9
1)
26
2)
33
4)
37
5)
8
96
35
7)
Torque (26) or (96)
Model Torque to
  ft. lbf. (14 Nm)
  ft. lbf. (35 Nm)
  ft. lbf. (71 Nm)
  ft. lbf. (81 Nm)
Fig. IPB2
) For model , on page 7
) Refer to table for torque instructions.
) Torque to  in.lbf. (5,7 Nm). After  hours, retorque to  in.lbf. (5,7 Nm).
) Model  ( 1/4in (113 mm)) air motor) only.
) Torque to – ft.lbs. (13,5 to 16,2 Nm).
) Refer to page 4 for service assemblies and kits.
) Align two holes on the cylinder tube (6) with two holes on air brake
before tightening tie rods (41) so that proper seal with o-rings is achieved.
NOTE
Do not cut or trim clear plastic laminate
around labyrinth assembly. The border of
untrimmed plastic is necessary to maintain a
good seal.


73
74
75
76
77
78
79 80
81
82
83
84
85
86
87
1)
88
1)
2)
) Optional tamper resistant cover.
) Single hole on (76) should align with single hole on (75).
17
19
20
23
24
31
32
35
35
39
40
48
49
50
51
52
53
54
57
58
59
60
61
62
63
64
65
66
67
91
55 92
56
49
Fig. IPB3
Fig. IPB4
Labyrinth assembly (67) detail


1)
2)
40
40 54 56
) Note holes at  and  o’clock positions.
) Molded pin on pump sleeve. Position to about  o’clock position as shown.
Fig. 17


33
524
18
361)
9
14
11
13
12
11
10
9
8
6
2
1
22
3
16
18
15
3
37
34
26
28
30
25
23
41
42
34
38
44
35
) Assemble adapter to piston rod using Loctite  Blue on threads.Torque to – ft. lbf. (81– 88 Nm). Model  only.
21
5
68
69
70
71
72
Fig. IPB5
Piston assembly models 94906 and 94908
Fig. IPB6
Piston assembly model 94910
Fig. 18
Model 94906 shown, others similar
21
5
68
69
33
Fig. IPB5
Piston assembly models 94904


24
50
51
67
87
88
95
94
) For repairs or upgrades to old style air brakes, bolt-on kit (93) will replace all necessary components on old style air brake to new configuration, utilizing new speed adjustment dial and related
components (Fig. 6).
Optional tamper resistant selector knob
cover kit (94) may be used to cover air brake
selector knob to prevent un-authorized
adjustment of air brake settings. Kit consists
of cover, special screw and special driver for
screw, as shown above. Cover prevents
access to selector knob and requires special
tool for removal. Tool is # drilled spanner
driver.
Optional signal kit  is used for
sending fault signals to remote alarm
locations (not shown).
Fig. IPB7
Air brake upgrade kit (93)


Service parts list
Item Description Quantity
Model 
( in diameter)
Model 
( in diameter)
Model 
( in diameter)
Model 
( 1/4in diameter)
U-cup (Buna-N) ) ) ) )
Rod bearing     
Seal, cylinder (Buna-N) ) ) ) )
O-ring (Buna-N) ) ) ) )
Piston rod assembly     
Cylinder tube     
Air tube     
Upper casting     
Bumper, valve ) ) ) )
 Cap, valve     
 O-ring (Buna-N) ) ) ) )
 Body, valve ) ) ) )
 Spool, valve ) ) ) )
 Cap, valve     
 Gasket  ) ) ) )
 O-ring (Buna-N) ) ) ) )
 Relay valve     
 O-ring (Buna-N) ) ) ) )
 O-ring (Buna-N) ) ) ) )
 Air signal valve     
 O-ring piston (Buna-N) ) ) ) )
 Lower casting     
 Screw (1/4- x -1/2in)     
 Screw (1/4- x 7/8in)     
 Tie rod   ) ) )
 Nut   ) ) )
 Screw     
 Gasket  ) ) ) )
 Muffler body     
 Screw (1/2- x  1/2in)     
 Signal valve cap kit)     
 Screw (- x 5/8in)) ) ) )
 Seal, Piston) ) ) ) )
 Screw    
 O-ring (Buna-N) ) ) ) )
 Adapter) ) ) ) 
) Also available as individual parts.
) Used on  (-1/4in) air motor only.
) Included in  cylinder tube soft parts kit for model  ( in air motor).
) Included in  cylinder tube soft parts kit for model  ( in air motor).
) Included in  cylinder tube soft parts kit for model  ( / in air motor).
) Included in  muffler element kit.
) Included in  soft parts kit for power valve subassembly.
) Included in  soft parts kit for air brake subassembly.
) Included in  signal valve cap kit, Item .
) Included in  cylinder tube soft parts kit for model  ( in Air motor).
) Included in  power valve and spool body.
) Not applicable.


Service parts list (continued)
Item Description Quantity
Model 
( in diameter)
Model 
( in diameter)
Model 
( in diameter)
Model 
( 1/4in diameter)
 Screw (1/4- x  1/4in)     
 Coupler     
 Screw, socket head cap (- x 7/8in)     
 Air filter ) ) ) )
 Tie rod     
 Nut (1/2-)     
 Muffler element ) ) ) )
 Nipple     
 End element ) ) ) )
 Muffler plate     
 Screw, self tapping (-)     
 Trip indicator     
 O-ring (Buna-N) ) ) ) )
 Upper body     
 Upper gasket (Nitrile) ) ) ) )
 Gasket plate ) ) ) )
 Lower gasket (Nitrile) ) ) ) )
 Lower body ) ) ) )
 Piston  ) ) ) )
 Pump sleeve ) ) ) )
 Diaphragm retainer ) ) ) )
 Diaphragm  ) ) ) )
 Spring  ) ) ) )
 Stop valve assembly ) ) ) )
 Diaphragm seal ) ) ) )
 O-ring (Buna-N) ) ) ) )
 Umbrella seal (Nitrile) ) ) ) ) ) ) ) )
 Quad ring (Buna-N) ) ) ) )
 Quad ring (Buna-N) ) ) ) )
 Spring pin     
 Labyrinth assembly     
 Screw   ) ) )
 Washer   ) ) )
 Piston   ) ) )
 O-ring (Buna-N) ) ) ) )
 Piston rod   ) ) )
) Included in  muffler element kit.
) Included in  soft parts kit forAir Brake subassembly.
) Included in  gasket and air filter kit (89).
) Included in  gasket plate with check valves (90).
) Included in  air pump repair kit (92).
) Included in  stop valve repair kit (91).
) Included in  cylinder tube soft parts kit for model  ( in air motor).
) Not available.


Service parts list (continued)
Item Description Quantity
Model 
( in diameter)
Model 
( in diameter)
Model 
( in diameter)
Model 
( 1/4in diameter)
 - x 1/2 in socket head cap screw     
 Gasket (nitrile/fiber)     
 Intermediate base     
 Gasket (nitrile/fiber)     
 Laminated labyrinth     
 Labyrinth cover     
 O-ring (nitrile)     
 - x  socket head cap screw     
 Ball     
 Index pin     
 Spring compression     
 Selector knob     
 Washer, spring     
 Selector bolt     
 Selector cover     
 Screw     
 Gasket and filter kit     
 Gasket plate and check valves     
 Stop valve repair kit     
 Air pump repair kit     
 Air Brake upgrade kit     
 Tamper resistant cover kit     
 Drilled spanned driver   )  )  )  )
 Tie bolts )   
) Optional: Included in tamper resistant kit.
) Not available.


Troubleshooting
Problem Possible cause Solution
Air motor is not operating, air is coming
from exhaust.
Inadequate air supply to air motor. Check air supply and adjust to minimum
recommended level. Check air supply hose
and piping for minimum recommended size.
Ensure FRL and quick disconnect couplings
meet or exceed minimum specified sizes and
do not restrict airflow to air motor.
Erratic or accelerated operation with short
stroking. Air motor hesitates on up or down stroke.
Dirty or damaged relay valve (17) or air signal
valve (20) or stop valve assembly (60).
Check valves and clean if necessary.
Replace any damaged seals or worn parts.
Pump cavitation. Check fluid level. Ensure pump inlet is not
blocked or restricted or is large enough to
handle flow into pump inlet.
Air brake trips off even though air motor is
operating below set trip speed (trips after
three or more strokes).
Dirty or blocked labyrinth plate or components. Clean or replace labyrinth components.
Check for grease or oil blocking air passages
in labyrinth subassembly. Blocked labyrinth
may be confirmed (in quiet locations) by
turning selector knob to RUN mode setting
immediately after air motor has stopped. If sudden
rush of air escaping is heard, labyrinth
is either blocked or installed incorrectly.
Grease or dirt on balls (81) in labyrinth cover (78). Clean balls and labyrinth cover with solvent.
Coat with very light film of light grease to hold balls
in cover.
Air brake trips even though air motor is
operating below set trip speed (within
three strokes).
Leaking diaphragm (58). Replace diaphragm.
Leaking upper gasket (51). Replace upper and lower gaskets (51 and 53).
Upper piston quad ring (64) is leaking. Replace quad ring.
Laminated labyrinth plate (77) is installed
incorrectly.
Observe laminated labyrinth plate and find
single hole (76)and align with hole (75) (Fig. 3).
Air brake trips at proper speed (as
indicated by sound of air surging into
diaphragm chamber), but air motor
does not stop. Indicator pin does not
pop out.
Stop valve vent hole in lower body (54) is clogged
or blocked. (Fig. 17)
Unclog vent hole in lower body.
Stop valve (60) is damaged. Check stop valve and replace if worn or
damaged.
Diaphragm seal is damaged, worn, deformed or
improperly installed.
Replace damaged or worn diaphragm seal.
If not damaged, reinstall into diaphragm (58)
with twisting action to fully seat in mating hole.
Inadequate air supply to air motor. See above for checking air supply. Ensure that
air regulator is set to air pressure at or greater than
minimum recommended air pressure for
air motor installed.
Air brake will not trip even though air motor
has been running above trip speed for more
than  minute.
Discharge umbrella valve (63) is damaged or worn. Replace both umbrella valves.
Diaphragm seal is damaged, worn deformed or
improperly installed.
Replace damaged or worn diaphragm seal.
If not damaged, reinstall into diaphragm (58)
with twisting action to fully seat in mating hole.
Leaking upper gasket (51) or lower gasket (53). Replace gaskets (51 and 53)
Stuck metering pump piston (55). Install air pump repair kit, replacing items
55, 56, 63, 64 and 65.
Inlet air filter (40) is completely or partially clogged. Clean or replace inlet air filter.


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January  · Form  Version 
Warranty
The instructions do not contain any information on the warranty.
This can be found in the General Conditions of Sales, available at:
www.lincolnindustrial.com/technicalservice or
www.skf.com/lubrication.