Norgren L74C Series User Manual

L74m, l74c, Installation & maintenance instructions, Micro-fog® and oil-fog tool lubricators l74

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L74M, L74C

Installation & Maintenance

Instructions

FILL RESERVOIR (OIL-FOG LUBRICATORS)
Remove fill plug (2), add oil, and reinstall fill plug. Fill plug
can be removed and oil added without shutting off air
pressure to the lubricator. Fill to maximum fill line on
transparent reservoirs. Oil level must always be visible in
lens on metal reservoirs. DO NOT OVERFILL.

FILL RESERVOIR (MICRO-FOG LUBRICATORS)
Shut off inlet air pressure and reduce pressure in reservoir
to zero. Remove fill plug (2), add oil, and reinstall fill plug.
Do not remove the fill plug when the reservoir is
pressurized, as oil will blow out the fill plug hole.
Micro-fog lubricators can be filled under pressure only if
equipped with the optional quick fill cap (4), which requires
a quick fill connector and oil pump. Fill to maximum fill line
on transparent reservoirs. Oil level must always be visible
in lens on metal reservoirs. DO NOT OVERFILL.

NOTE: Oil fill plug (2) seals easily. Tighten finger-tight only.

ADJUSTMENT
1. Turn on system pressure.
2. Adjust lubricator drip rate only when there is a constant

rate of air flow thru the lubricator. Monitor drip rate thru
sight feed dome (6).

3. Oil-Fog Lubricators - Determine the average rate of flow

thru the lubricator. Turn green rotator in sight feed dome
(6) to obtain one drop per minute for each 5 dm

3

/s (10

scfm). For example, if the average flow is 19 dm

3

/s (40

scfm), set the drip rate at 4 drops per minute. Turn
rotator counterclockwise to increase and clockwise to
decrease the drip rate. Total travel of rotator is 320°.

4. Micro-Fog Lubricators - Determine the average rate of

flow thru the lubricator. Turn red rotator in sight feed
dome (6) to obtain the recommended drops per minute.
See Drip Rate Chart. Turn rotator counterclockwise to
increase and clockwise to decrease the drip rate. Total
travel of rotator is 320°.
Drip Rate Chart for Micro-Fog Lubricators
Flow - dm

3

/s (scfm)

Drops per Minute

2.4 (5)

10

5 (10)

11

9 (20)

13

14 (30)

15

19 (40)

17

24 (50)

19

28 (60)

22

34 (70)

24

38 (80)

26

43 (90)

28

48 (100)

30

5. Monitor the device being lubricated for a few days

following initial adjustment. Adjust the drip rate if the oil
delivery at the device appears either excessive or low.

DISASSEMBLY
1. Shut off inlet pressure. Reduce pressure in inlet and

outlet lines to zero. Loosen fill plug (2).

2. Remove reservoir - push into body and turn

counterclockwise.

3. Disassemble in general accordance with the item

numbers on exploded view. Do not remove the manual
drain unless replacement is necessary. Remove and
replace drain assembly only if drain malfunctions. Do not
remove siphon tube (51). Remove and replace cartridge
assemblies (52 thru 57B) only if lubricator malfunctions.

CLEANING
1. Clean plastic reservoir with warm water only. Clean other

parts using warm water and soap.

2. Dry parts. Blow out internal passages in body with clean,

dry compressed air.

3. Inspect parts. Replace parts found to be damaged. If

plastic reservoir shows signs of cracking or cloudiness,
replace with a metal reservoir.

TECHNICAL DATA
Fluid: Compressed air
Maximum pressure:

Transparent bowl: 10 bar (150 psig)
Metal bowl: 17 bar (250 psig)

Operating temperature*:

Transparent bowl: -20° to +50°C (0° to +125°F)
Metal bowl: -20° to +80°C (0° to +175°F)

* Air supply must be dry enough to avoid ice formation at

temperatures below +2°C (+35°F).

Start point (minimum flow required for lubricator

operation) at 6,3 bar (90 psig) inlet pressure:
0,94 dm

3

/s (2.5 scfm)

Typical flow with 6,3 bar (90 psig) inlet pressure and 0,5

bar (7 psig) pressure drop: 70 dm

3

/s (148 scfm)

Nominal bowl size:

Standard: 0,2 litre (7 fluid ounce)
Optional: 1 litre (1 quart US)

Manual drain connection: 1/8"
Materials:

Body: Aluminum
Bowl:

Transparent with guard: Polycarbonate, steel guard
Metal: Aluminum
Metal bowl liquid level indicator lens:

0,2 litre (7 fluid ounce): Transparent nylon
1 litre (1 quart US): Pyrex

Sight-Feed dome: Transparent nylon
Elastomers: Neoprene and nitrile

REPLACEMENT ITEMS
Service kit (includes items circled

on exploded view) ..............................................4382-700

Liquid level lens kit

0,2 litre (7 fluid ounce) bowl

(34, 36, 37, 38, 45, 47, 48, 49) .....................4380-050

1 litre (1 quart US bowl) (61, 65, 67 thru 70)......2273-22

Manual drain (18, 19, 20) (28, 29, 30) ......................619-50

INSTALLATION
1. Shut-off air pressure. Install lubricator in air line -

vertically (reservoir down),

with air flow in direction of arrow on body,

Micro-fog and Oil-fog Uni-directional models:
upstream of cycling valves.

Oil-fog Bi-directional models:
upstream or downstream of cycling valves.

as close as possible to the device being lubricated,

Oil-Fog Models - Not more than 5,2m (15 feet) from
the device being lubricated, and at the same height or
higher than the device.

2. Connect piping to proper ports using pipe thread sealant

on male threads only. Do not allow sealant to enter
interior of unit.

3. Push reservoir, or reservoir with guard, into body and

turn fully clockwise before pressurizing.

RECOMMENDED LUBRICANTS
Use a good quality, light, misting type oil for compressed
air tools. See Norgren publication N/AL.8.900.935.

© Norgren 2002

50

34

35

36

39

37

38

33

28

32

30

29

31

27

Current Metal Bowl

40

Early Plastic Bowl

Early Metal Bowl

44

49

Current Plastic Bowl

17

26

25

24

23

22

18

20

19

21

45

46

48

47

42

41

43

Optional 1 Quart (1 Litre) Bowl

58

59

65

66

68

69

70

68

66

67

63

60

64

62

1

51

52

54

55

53

4

5

2

3

61

8

9

6

7

56

57

57A

57B

Current
Cartridge

Early
Cartridge

Micro-Fog® and Oil-Fog

Tool Lubricators

L74

- ★★★ - ★★★

Thread Form
A....PTF
B....ISO Rc taper
G....ISO G parallel

Bowl
A....Optional 1 litre (1 quart US) metal
D....Metal with plastic liquid level indicator
P....Transparent with guard
R....Metal with Pyrex liquid level indicator

Options
N....None
P....Pyrex sight-feed dome
Q....Quick fill nipple

Drain
E ....Closed bottom
Q....Manual, 1/4 turn
R....Remote fill

Air Flow Direction
E ....Bi-directional (Oil-fog only)
P....Uni-directional

Type
C....Oil-Fog
M...Micro-Fog

Port
3 ....3/8"
4 ....1/2"
6 ....3/4"

a subsidiary of IMI plc

IM-200.400.01

(5/02)

Supersedes 4/99

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