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Maintenance - routine, V-belt drives, Wheels – Greenheck DG/DGX Pilot Ignition (470651_IOM) User Manual

Page 34: Bearings, Snow accumulation

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Maintenance - Routine

CAUTION

Lock-out the gas and the electrical power to the
unit before performing any maintenance or service
operations to this unit.

V-Belt Drives

V-belt drives must be checked on a regular basis for
wear, tension, alignment, and dirt accumulation.
Check the tension by measuring the deflection in the
belt as shown below.
Check the alignment by using a straight edge across
both sheaves as shown below.

Wheels

Wheels require little attention when moving clean air.
Occasionally oil and dust may accumulate on the
wheel causing imbalance. When this occurs the wheel
and housing should be cleaned to assure proper
operation.

Bearings

The bearings for our fans are carefully selected to
match the maximum load and operating conditions
of the specific class, arrangement and fan size.
The instructions provided in this manual and those
provided by the bearing manufacturer will minimize
any bearing problems.

Belt Tension

Belt Span

Deflection = Belt Span

64

FAN

MOTOR

FAN

MOTOR

Drive Alignment

IMPORTANT

Premature or frequent belt failures can be caused by

improper belt tension, or misaligned sheaves.

• Abnormally high belt tension or drive misalignment

will cause excessive bearing loads and may result

in failure of the fan and/or motor bearings.

• Abnormally low belt tension will cause squealing

on start-up, excessive belt flutter, slippage, and

overheated sheaves.

IMPORTANT

Do not pry belts on or off the sheave. Loosen belt
tension until belts can be removed by simply lifting
the belts off the sheaves.

IMPORTANT

When replacing V-belts on multiple groove drives,
all belts should be changed to provide uniform drive
loading.

IMPORTANT

Do not install new belts on worn sheaves. If the
sheaves have grooves worn in them, they must be
replaced before new belts are installed.

IMPORTANT

Lubricate bearings prior to periods of extended
shutdowns or storage and rotate shaft monthly to
aid in corrosion prevention. If the fan is stored more
than three months, purge the bearings with new
grease prior to start-up.

Recommended Bearing Lubrication Schedule

(in months*)

Fan

RPM

Bearing Bore Size (inches)

1

2

- 1

1

1

8

- 1

1

2

1

5

8

- 1

7

8

1

15

16

- 2

3

16

2

7

16

- 3

250

6

6

6

6

6

500

6

6

6

5

4

750

6

5

4

3

3

1000

5

3

2

1

1

1250

5

3

2

1

1

1500

5

2

1

1

0.5

2000

5

1

1

0.5

0.25

*Suggested initial greasing interval is based on 12 hour per

day operation and 150°F maximum housing temperature.

For continuous (24 hour) operation, decrease greasing

interval by 50%

• If extended grease lines are present, relubricate while in

operation, only without endangering personnel.

• For ball bearings (operating) relubricate until clean grease

is seen purging at the seals. Be sure not to unseat the seal

by over lubricating.

• For ball bearings (idle) add 1-2 shots of grease up to 2

inch bore size, and 4-5 shots above 2 inch bore sizes with

a hand grease gun.

• For roller bearings add 4 shots of grease up to 2 inch bore

size, and 8 shots for 2-5 inch bore size with a hand grease

gun.

• Adjust relubrication frequency based on condition of

purged grease.

• A high quality lithium based grease conforming to NLGI

Grade 2 consistency, such as those listed here:

Mobil 532

Mobilux #2

Texaco Multifak #2

Texaco Premium #2

B Shell Alavania #2

Exxon Unirex #2

Snow Accumulation

Clear snow away from roof mounted units. Keep the
snow clear of the intake and access doors.

Model DG / DGX Pilot Ignition Make-Up Air

34

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