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Inspection, Maintenance, Lubrication – COOK CPL User Manual

Page 5: Lubrication - fan bearings, Start up

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5

• Bearings should be inspected as recommended in the

Conditions Chart.

• Inspect variable inlet vanes for freedom of operation

and excessive wear. The vane position should agree
with the position of the control arm. As the variable inlet
vanes close, the entering air should spin in the same
direction as the wheel.

• Inspect isolation base for freedom of movement.
• Inspect springs and rubber isolators for deterioration

and replace as needed.

• Inspect for cleanliness. Clean exterior surfaces only.

Removing dust and grease on motor housing assures
proper motor cooling. Removing dirt from the wheel
and housing prevent imbalance and damage.

Lubrication - Fan Bearings

Bearings are lubricated through a grease fitting on the

exterior of the fan housing and should be lubricated by the
schedule, Lubrication Conditions Chart.

For best results, lubricate the bearing while the fan is in

operation. Pump grease in slowly until a slight bead forms
around the bearing seals. Excessive grease can burst
seals thus reducing bearing life.

Before lubricating, the grease nipple and immediate

vicinity should be thoroughly cleaned without the use of
high pressure equipment. The grease should be supplied
slowly as the bearing rotates until fresh grease slips past
the seal. Excessive pressure should be avoided to prevent
seal damage.

Use no more than three injections with a hand-operated

grease gun.

Exceptions to the greasing interval chart:

Periodic Applications (any break of one week or

more): it is recommended that full lubrication be per-
formed prior to each break in operation.

Higher Temperature: it is recommended to halve the

intervals for every 30

F increase in operating temperature

above 120

F not to exceed 230F for standard bearings;

High Temperature bearings (optional) can operate up to
400

F.

Vertical Shaft: it is recommended that the intervals
should be halved.

Loren Cook Company uses petroleum lubricant in a lith-

ium base. Other types of grease should not be used unless
the bearings and lines have been flushed clean. If another
type of grease is used, it should be a lithium-based grease
conforming to NLGI grade 2 consistency.

A NLGI grade 2 grease is a light viscosity, low-torque,

rust-inhibiting lubricant that is water resistant. Its tempera-
ture range is from -30

F to +200F and capable of intermit-

Start Up

Turn the fan on. In variable speed units, set the fan to its

lowest speed and inspect for the following:

• Direction of rotation.
• Excessive vibration.
• Unusual noise.
• Bearing noise.
• Improper belt alignment or tension (listen for squeal-

ing).

• Improper motor amperage or voltage.

NOTICE! If a problem is discovered, immediately shut
the fan off. Lock out all electrical power and check for
the cause of the trouble.
See Troubleshooting.

Inspection

Inspection of the fan should be conducted at the first 30

minute, 8 hour and 24 hour intervals of satisfactory opera-
tion. During the inspections, stop the fan and inspect as per
the Conditions Chart.

30 Minute Interval

Inspect bolts, setscrews, and motor mounting bolts.

Adjust and tighten as necessary.

8 Hour Interval
Inspect belt alignment and tension. Adjust and tighten as
necessary.

24 Hour Interval
Inspect belt tension, bolts, setscrews, and motor mount-
ing bolts. Adjust and tighten as necessary.

Maintenance

Establish a schedule for inspecting all parts of the fan.

The frequency of inspection depends on the operating con-
ditions and location of the fan.

Inspect fans exhausting corrosive or contaminated air

within the first month of operation. Fans exhausting con-
taminated air (airborne abrasives) should be inspected
every three months.

Regular inspections are recommended for fans exhaust-

ing non-contaminated air.

It is recommended the following inspection be conducted

twice per year.

• Inspect bolts and setscrews for tightness. Tighten as

necessary. Worn setscrews should be replaced imme-
diately.

• Inspect belt wear and alignment. Replace worn belts

with new belts and adjust alignment as needed. Refer
to Belt and Pulley Installation, page 4.

Lubrication Conditions Chart

Fan Class

Fan Status

Shaft Size

Maximum Interval

(operational hrs)

Centrifugal Blower

Class I

Normal Conditions

(Clean, Dry & Smooth)

> 1-1/2”

10,000

< 1-1/2”

2,000

Extreme Conditions

(Dirty/Wet/Rough)

> 1-1/2”

2,000

< 1-1/2”

400

Centrifugal Blower

Class II

Normal Conditions

(Clean, Dry & Smooth)

> 2”

7,500

< 2”

1,000

Extreme Conditions

(Dirty/Wet/Rough)

> 2”

1,500

< 2”

200

Centrifugal Blower

Class III

Normal Conditions

(Clean, Dry & Smooth)

> 2”

3,000

< 2”

500

Extreme Conditions

(Dirty/Wet/Rough)

> 2”

500

< 2”

100

Recommended Torque for Setscrews/Bolts (IN/LB.)

Setscrews

Hold Down Bolts

Size

Key Hex

Across

Flats

Recommended

Torque

Min.

Max.

Size

Wrench

Torque

No.10

3/32”

28

33

3/8”-16

240

1/4”

1/8”

66

80

1/2”-13

600

5/16”

5/32”

126

156

5/8”-11

1200

3/8”

3/16”

228

275

3/4”-10

2100

7/16”

7/32”

348

384

7/8”- 9

2040

1/2”

1/4”

504

600

1”- 8

3000

5/8”

5/16”

1104

1200

1-1/8” - 7

4200

3/4”

3/8”

1440

1800

1-1/4” - 7

6000