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

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

Greasable fan bearings are lubricated through a grease

fitting on the bearing and should be lubricated by the

schedule, 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.

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. For temperatures above 250°F

Mobiltemp SHC 32 is recommended.

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 compatable grease such as Exxon Mobil Polyrex EM

and Chevron SRI.

The above intervals should be reduced to half for verti-

cal 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 represen-

tative.

Changing Shaft Speed

All belt driven fans with motors up to and including 5 HP

(184T max.) 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 fac-

ing. 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 maintained.

Replacing Pulleys and Belts

a. Remove pulleys from their respective shafts.

b. Clean the motor and fan shafts.

c. Clean bores of pulleys and coat the bores with heavy

oil.

d. Remove grease, rust, or burrs from the pulleys and

shafts.

Relubrication Intervals

Service

Conditions

NEMA Frame Size

Up to and

including 184T

213T-365T 404T and larger

1800 RPM

and less

Over

1800 RPM

and less

Over

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

Unless otherwise noted wheel construction for standard duty and heavy duty

is the same. *Standard duty, **Heavy duty

Unit

Size

Maximum RPM

Unit

Size

Maximum RPM

SD* HD** SD* HD**

70 3742 6236 190 1389 2315

90 2934 4889 210 1256 2093

110 2397 3994 230 1146 1910

130 2026 3377 260 1016 1693

150 1755 2924 290 908 1513

170 1547 2579

Lubrication Conditions Chart

Fan Class Fan Status Shaft Size

Maximum Interval

(operational hrs)

Standard Duty

Normal Conditions

(Clean, Dry & Smooth)

> 2” 7,500

< 2” 1,000

Extreme Conditions

(Dirty/Wet/Rough)

> 2” 1,500

< 2” 200

Heavy Duty

Normal Conditions

(Clean, Dry & Smooth)

> 2” 3,000

< 2” 500

Extreme Conditions

(Dirty/Wet/Rough)

> 2” 500

< 2” 100

1 2 3 4 5 6 7 8

Commentaires sur ces manuels

Pas de commentaire

Cook IMH Manuel d'utilisateur Page 6

Commentaires sur ces manuels

Produits connexes et manuels pour Cuisine Cook IMH