Duff-Norton SK-2389 Installation, Operation & Maintenance Instructions Manual - Page 4

Browse online or download pdf Installation, Operation & Maintenance Instructions Manual for Controller Duff-Norton SK-2389. Duff-Norton SK-2389 8 pages. Translating machine screw actuators of two ton to 75 ton capacity

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tors are designed to be adjusted for minimum

backlash, approximately .002 inch. The worm

gear and anti-backlash nut are manufactured to

have a clearance between their surfaces of 1/2

the thread thickness. When adjustments have

been made to the point where all this clearance

is gone, 50% of the thread thickness is gone

and replacement is necessary. (See paragraph

2-8 for a detailed explanation of how the anti-

backlash nut functions.)

Note

For loads of from 25% to 100% of actuator

capacity, torque requirements are approximately

proportioned to the load.

8. The lubrication procedures for normal and

severe service conditions, as described in

Section II, paragraph 2-1, should be closely

followed.

1-5. Warranty and Warranty Repair

Subject to the conditions stated herein, Duff-

Norton will repair or replace, without charge, any

parts proven to Duff-Norton's satisfaction to have

2-1. Lubrication

Unless otherwise specified, actuators are

shipped packed with grease which should be suffi-

cient for one month of normal operation. For normal

operation, the actuator should be lubricated once a

month using Extreme Pressure grease Shell Oil Co.

Albida LC EP #2 (Shell Product Code 70311).

This grease has been thoroughly evaluated in

Duff-Norton actuators and has demonstrated supe-

rior lubricating properties affecting both wear life

and maximum duty cycle. Duff-Norton is not aware

of an equivalent grease. If this grease is not

available in your area please contact your local

supplier for their recommendations. Greases con-

taining molybdenum disulfide should never be used.

For severe service conditions, the actuators

should be lubricated more frequently using the

above grease (daily to weekly depending upon the

conditions). If duty is heavy, an automatic lubrication

system is strongly recommended.

CAUTION

Where lifting screws are not protected from

airborne, dirt, dust, etc., bellows boots should

be used. Inspect frequently at regular intervals

to be certain that a lubricating film is present.

Lifting screws should never be run dry.

been defective in material or workmanship. Claims

must be made within one year after date of ship-

ment. Duff-Norton will not repair or replace any

parts that become inoperative because of improper

maintenance, eccentric loading, overloading, chemi-

cal or abrasive action, excessive wear, or other

abuse.

Equipment and accessories not of Duff-Norton's

manufacture are warranted only to the extent that

they are warranted by the manufacturer, and only if

the claimed defect arose during normal use, appli-

cations and service. Equipment which has been

altered or modified by anyone without Duff-Norton's

authorization is not warranted by Duff-Norton.

EXCEPT AS STATED HEREIN, DUFF-NORTON

MAKES NO OTHER WARRANTIES, EXPRESS OR

IMPLIED, INCLUDING WARRANTIES OF MER-

CHANTABILITY AND FITNESS FOR A PARTICU-

LAR PURPOSE.

If you have any questions concerning warranty

repair, please contact Duff-Norton. Authorization for

return must be received from Duff-Norton before

returning any equipment for inspection or warranty

repair.

Section II

Maintenance

2-2. Rebuild Procedure

Duff-Norton recommends the following proce-

dures for assembly and disassembly of actuators.

1. Tag critical parts to facilitate reassembly.

2. Mark mating surfaces to ensure proper meshing.

3. Clean and lubricate all parts as required.

4. All seals must be replaced when rebuilding.

5. All screws, washers and other small common

parts must be replaced if damaged in any way.

6. Replace damaged or frozen lubrication fittings

with new ones.

2-3 Required Tools

A bearing puller or press, and common hand

tools are necessary for proper assembly and disas-

sembly.

2-4. Disassembly (Refer to Figure 3-1)

1. Remove lifting screw (5) from actuator.

2. Remove bottom pipe (4) from shell (3) (upright

models) or shell cap (2) (inverted models) or

base plate as applicable.

3. Loosen and remove set screws (1) in cap (2)

and remove cap from shell (3).

It may be necessary to break shell cap or base

plate loose with a hammer.

Note