Duff-Norton SK-2389 Інструкція з монтажу, експлуатації та технічного обслуговування - Сторінка 6

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as required.

7. Install top load bearing (7) or bearing cup on

worm gear (6A) or worm gear and nut assembly

(6B).

8. Fill housing fully with grease.

9. Install shell cap (2) and screw down until tight.

Note

Shell cap flange does not necessarily have to

bear against top of shell, there will usually be a

gap. This will put a slight drag on the worm. If

worm is hard to turn, back off slightly on the

shell cap.

10. Lock base plate in place with set screws.

Note

If new parts have been installed, it may be

necessary to respot holes for these screws.

11. Screw bottom pipe (4) into shell (3) (upright

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

12. Brush lifting screw (5) with a light film of grease

and install in actuator. On inverted models,

install guide bushing (16) and then install lifting

screw (5).

13. If actuator is keyed, install key in shell cap (2)

and bolt in place.

14. Operate unit to ensure proper functioning of all

components prior to reinstallation.

2-8. Anti-Backlash Nut Function

As shown in Figure 2-1, the worm gear (2) and

anti-backlash nut (3) are pinned together with guide

pins. The threads in the anti-backlash nut work in

opposition to the threads in the worm gear as they

3-1. General

This section contains an exploded illustration of the

1800, 9000, 4800 and 9400 Series translating machine

screw actuators. The number adjacent to each part on

the illustration is the index number. Keyed to this index

3-2. Parts List For 1800 (2000), 9000 (10000), 4800 (5800) and 9400 (10400) Series Translating

Machine Screw Actuators.

I n d e x

N o .

Part Name

Screw, Set

Cap, Shell

Shell, Actuator

Pipe, Bottom

Screw Assembly, Lifting

Worm Gear

Worm Gear and Anti-backlash Nut

Assembly (Mfg'd and sold in sets

only)

Bearing, Top Load

Bearing, Bottom Load

engage the threads of the lifting screw (1). Adjust-

ment of backlash is made by running down on the

shell cap of the actuator. This forces the anti-back-

lash nut threads into closer contact, reducing clear-

ance and thus reducing backlash.

2-9. Anti-Backlash Nut Adjustment

1. To minimize backlash remove the two set

screws (4) and tighten down on shell cap until

the desired backlash is obtained. Spot drill top of

shell through set screw holes, then replace set

screws and tighten to prevent shell cap backing

off.

2. To avoid binding and excessive wear, do not

adjust lifting screw backlash to less than 0.002

inch.

3. The clearance (A) designed into the worm gear

and anti-backlash nut set is one-half the thread

thickness. When adjustments have been made

to use all this clearance replace the worm gear

and anti-backlash nut as a set.

Figure 2-1. Anti-Backlash Nut Adjustment

Section III

Illustrated Parts List

number on the parts list is the part name.

When ordering parts be sure to include:

1. The nameplate model of your unit.

2. Index number and name of part.

Q t y .

I n d e x

R e q .

N o .

1 0

1 1

1 2

1 3

1 4

1 5

1 6

1 8

Part Name

Screw, Cap

Washer, Lock

Flange, Worm

Shim, Flange

Seal, Oil

Worm

Bearing, Worm

Bushing, Guide (inverted model o

Nameplate

Q t y .

R e q .

1 2