Cook Lo-Pro Bedienungsanleitung PDF herunterladen (Seite 5)

Direct Drive 1050/1075,1200,1300 &1500 rpm units use

a prelubricated sleeve bearing that has a oil saturated wick-

ing material surrounding it. The initial factory lubrication is

adequate for up to 10 years of operation under normal con-

ditions. However, it is advisable to add lubricant after 3

years. Use only LIGHT grade mineral oil or SAE 10W oil up

to 30 drops. If the unit has been stored for a year or more it

is advisable to lubricate as directed above. For VCR direct

drive units and other units in severe conditions, lubrication

intervals should be reduced to half.

Motors without sleeve bearings (as described above) will

have grease lubricated ball or roller bearings. Motor bear-

ings without provisions for relubrication will operate up to

10 years under normal conditions with no maintenance. In

severe applications, high temperatures or excessive con-

taminates, it is advisable to have the maintenance depart-

ment 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

Maximum RPM

LPB

Size

Maximum RPM

LPB

Size

Maximum RPM

Standard Reinforced Standard Reinforced

100 3320 - 245 1011 1335

120 2755 - 270 871 1154

135 2481 - 300 835 1121

150 2051 - 330 713 963

165 1832 1971 365 623 884

180 1608 1754 402 538 746

195 1428 1758 445 462 739

210 1270 1507 490 357 682

225 1143 1319 540 345 581

Changing Shaft Speed

All belt driven H-Series fans with motors up to and includ-

ing 5HP are equipped with variable pitch pulleys. To

change the fan speed, perform the following:

a. Loosen setscrew on driver (motor) pulley and remove

key, if equipped.

b. Turn the pulley rim to open or close the groove facing.

If the pulley has multiple grooves, all must be adjusted

to the same width.

c. After adjustment, inspect for proper belt tension.

Speed Reduction

Open the pulley in order that the belt rides deeper in the

groove (smaller pitch diameter).

Speed Increase

Close the pulley in order that the belt rides higher in the

groove (larger pitch diameter). Ensure that the RPM limits

of the fan and the horsepower limits of the motor are main-

tained.

Replacing Pulleys and Belts

a. Clean the motor and fan shafts.

b. Loosen the motor plate mounting bolts to relieve the

belt tension. Remove the belt.

c. Loosen the pulley setscrews and remove the pulleys

from the shaft.

If excessive force is required to remove the pulleys, a

three-jaw puller can be used. This tool, however, can easily

warp a pulley. If the puller is used, inspect the trueness of

the pulley after it is removed from the shaft. The pulley will

need replacement if it is more than 0.020 inch out of true.

d. Clean the bores of the pulleys and place a light coat of

oil on the bores.

e. Remove grease, rust and burrs from the shaft.

f. Place fan pulley on the fan shaft and the motor pulley

on the motor shaft. Damage to the pulleys can occur

when excessive force is used in placing the pulleys on

their respective shafts.

g. After the pulleys have been correctly placed back onto

their shafts, tighten the pulley setscrews.

h. Install the belts on the pulleys. Align and adjust the belts

to the proper tension as described in Belt and Pulley Instal-

lation, page 2.

Replacing Grease Terminator

Set up a regular schedule for changing the Grease Termi-

nator. Depending on the amount of grease going through

the fan, the Grease Terminator should be changed every

30 to 45 days. To replace the Grease Terminator, simply

unscrew the used canister and screw on a new one.

Notice! If the Grease Terminator becomes completely

saturated, grease will no longer be absorbed and will

run through to the roof.

Bearing Replacement

The fan bearings are pillow block ball bearings.

a. Loosen screws on bearing cover.

b. Push bearing cover toward the wheel. As the bearing

cover moves toward the wheel it will slide down to reveal

the bearings and shaft.

c. Remove the old bearing.

d. Remove any burrs from the shaft by sanding.

For moist or otherwise contaminated installations; divide the interval by a

factor of 3. For vertical shaft installations divide the interval by a factor of 2.

Conditions Chart

RPM Temp °F Greasing Interval

Up to 1000

-30 to 120 6 months

120 to 200 2 months

1000 to 3000

-30 to 120 3 months

120 to 200 1 month

Over 3000

-30 to 120 1 month

120 to 200 2 weeks

Any Speed < -30 Consult Factory

Any Speed > 200 1 week

1 2 3 4 5 6 7 8

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