Cook QMX Manuel d'utilisateur télécharger pdf (Page 6)

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.

• Inspect belt wear and alignment. Replace worn belts

with new belts and adjust alignment as needed. Refer

to Belt and Pulley Installation, page 3.

• Bearings should be inspected as recommended in the

Conditions Chart.

• Inspect variable inlet vanes (if supplied) 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 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 prevents imbalance and damage.

Lubrication - Fan Bearings

QMX bearings are lubricated through a grease fitting on

the outer housing and should be lubricated by the sched-

ule, 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.

Lubrication Conditions Chart

Fan Class Fan Status Shaft Size

Maximum Interval (opera-

tional hrs)

QMX

Normal Conditions

(Clean, Dry & Smooth)

> 1-1/2” 7,500

< 1-1/2” 2,000

Extreme Conditions

(Dirty/Wet/Rough)

> 1-1/2” 1,500

< 1-1/2” 400

QMX-HP

Normal Conditions

(Clean, Dry & Smooth)

> 2” 5,000

< 2” 1,000

Extreme Conditions

(Dirty/Wet/Rough)

> 2” 1,000

< 2” 200

Recommended Torque for Setscrews/Bolts

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” 29 348 7/8”-9 2400

1/2” 1/4” 42 504 1” -8 3000

5/8” 5/16” 92 1104

3/4” 3/8” 120 1440

(IN/LB)

In the event the bearing cannot be seen, use no more than

three injections with a hand-operated grease gun.

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.

Exceptions to the greasing interval chart:

• Periodic Applications (any break of one week or

more): it is recommended that full lubrication be performed

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-

tent highs of +250F.

Lubrication - Motor Bearings

Motors are provided with prelubricated bearings. Any

lubrication instructions shown on the motor nameplate

supersede instructions below.

Motor bearings without provisions for relubrication will

operate up to 10 years under normal conditions with no

maintenance. In severe applications, high temperatures or

excessive contaminates, it is advisable to have the mainte-

nance department disassemble and lubricate the bearings

after 3 years of operation to prevent interruption of service.

For motors with provisions for relubrication, follow inter-

vals of the table below.

Motors are provided with a polyurea mineral oil NGLI #2

grease. All additions to the motor bearings are to be with a

compatible grease such as Exxon Mobil Polyrex EM and

Chevron SRI.

The above intervals should be reduced to half for vertical

shaft installations.

Motor Services

Should the motor prove defective within a one-year

period, contact your local Loren Cook representative or

your nearest authorized electric motor service representa-

tive.

Relubrication Intervals

Service

Conditions

NEMA Frame Size

Up to and

including 184T

213T-365T 404T and larger

1800 RPM

and less

Over 1800

RPM

1800 RPM

and less

Over 1800

RPM

1800 RPM

and less

Over 1800

RPM

Standard 3 yrs. 6 months 2 yrs. 6 months 1 yr. 3 months

Severe 1 yr. 3 months 1 yr. 3 months 6 months 1 months

1 2 3 4 5 6 7 8 9 10 11 12

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Cook QMX Manuel d'utilisateur Page 6

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