Dover OPW 788 Series Bedienungsanleitung

Worm Gear Hex Drive

www.opw-es.com

790 Series Counterbalance

PART #H30790PA

790-SERIES-IOM-EN-01/2021

NOTE: Prior to any loading arm disassembly, spring tension should be

completely relieved. Tip: To relieve tension, arm should be pushed up as

much as possible and supported while spring tension is relieved. Spring

coil will be loose in housing when completely relieved of tension.

Equipment: Torsion Balance Type: 790A,B,C

Balance Unit for Balancing Loading Arms

Suitable for: Loading Arm Balancing

Easy, Precise Adjustment No special tools required

Speciﬁcations

Type: Right-Hand: 790A-0020 (White),

790B-0030 (Yellow), 790C-0050 (Red)

Left-Hand: 790ALH-0025 (Black),

790BLH-0035 (Gray), 790CLH-0045 (Orange)

Working Temperature Range:

-40°F to 176°F (-40°C to +80°C)

Installation

Spring Unit Assembly

1. Position balance unit on the bosses at back of swivel joint.

2. Fix balance unit with Bolts and Lock Washers.

3. Attach backside of Link Arm [17] to Spring Arm [15] with Pin

[16] and 2 Retaining Rings [14].

4. Remove the 4 Socket Head Screws [18] and take Snubber

Block [26] off.

5. Raise loading arm to highest position (as vertical as possible).

6. Attach front side of Link Arm [17] to mounting ears on loading

arm with Pin [16] and 2 Retaining Rings [14].

7. Check balancing action by pulling down the arm. If adjustment is

necessary, follow adjustment instructions below.

8. Install lock-down unit 788-L, if used, by following 788-L

installation instructions.

9. Replace Cover [21] using alignment pins [1] and latches [22].

Adjustment

When to adjust torque

A. To raise loading arm higher or for more lifting action INCREASE torque.

B. To decrease loading arm vertical travel or to slow the rate at which the arm rises, DECREASE torque.

C. Note: Prior to any disassembly, Spring balance tension should be completely relieved to allow safe disassembly of level arm.

Torque

For more lifting action increase torque.

For less lifting action decrease torque.

Place ¾"socket wrench on worm gear hex drive.

To INCREASE torque rotate the worm gear hex drive

counterclockwise (to the left).

To DECREASE torque rotate the worm

gear hex drive clockwise (to the right).

Easy-To-Use

Spring Cover Latch

Index Qty Part # Description

1 4 H-31396-M Spirol Pin, 1⁄4x 13⁄4

2 1 C-20185-BW Spring Regulator, R.H. Worm Gear

3 1 H-30744-M Dowel Pin .25 x 1.25

4 2 H-01490-M Flange, Bearing, BRZ. 11⁄2" DIA x 11⁄4" LG

5 2 H-32283-M Retaining Ring, CST ZP

6 2 H-32282-M Bearing, Cylindrical, Bronze

7 1 H-30743-M Washer, Thrust, ZP, 7⁄8"

8 1 C-20184-EW Drive Worm, Torsion Spring

9 2 H-30741-M Screw, Drive #10 x 3⁄8"

10 1 H-30740-M Worm Cover Plate, Spring Balance

11 1 H-30018-M Bolt, 1⁄2"-13 x 31⁄2

12 1 H-30049-M Jam Nut, Hex, CST, ZP, 1⁄2"-13

13 1 E20074D1 790 Support Bracket, D1

14 2 H-30321-M Retaining Ring, CST, 5⁄8"

15 1 D-00350-D1 Spring Arm, PTD, D1

16 1 H-30320-RE Pin, Torsion Spring, SST

Index Qty Part # Description

17** 1 E-20041-D1 Link Arm, D1

18 4 H-31278-M Socket Head Screw, ZP, .31-18 X 1"

19 2 H-02507-M Lockwasher, CP, 5⁄8"

20 2 H-05910-M Screw, Hex Cap, CST, ZP, 5⁄8"-11 x 13⁄4"

21 1 E20181 790 Spring Balance Cover, RH

22 2 H32321M Spring Cover Latch (SouthCo)

23 4 H32322M Screw, Thread Forming, 8-32

24 1 C-00626-M Spring, Torsion, C

25 1 H-30742-RS Bar, Safety

26 1 H-01489-D1 Snubber Block, RH, D1

27 4 H-03563-M Washer, Lock, ZP, 5⁄16"

28 1 H-01486-RB Snubber Retainer, Brass, 11⁄8-12 x 1⁄2"

29 1 H-01487-RE Snubber Plunger, SST, 15⁄16" DIA x 19⁄16" LG

30 1 H-01502-M Spring, Compression, ZP

31 1 C00635D1 Support, RH Side, D1

www.opw-es.com

Parts List: 790 Series Counterbalance*

*790C (Right-Hand) shown in image. Spring Coil (24) would change depending on model.

** For 790A Units, Link Arm (17) would be C00636DI.

Jam Nut

Stop Bolt

Pivot Pin

Snubber Block

788, 789 Series

Spring Keeper Bolts

Adjusting Nut

Spring Keeper

Spring Regulator

790 Series Counterbalance

Travel Stop 788, 789, 790 Series

Upward

Remove the (4) socket head screws in snubber

block, then rotate snubber block toward pivot

pin to allow for more upward travel or away

from pivot pin for less upward travel.

Replace the (4) screws and tighten.

Adjustment 788, 789 Series

When to adjust torque

NOTE: Left hand spring balance shown.

NOTE: The worm gear adjustment mechanism provides signiﬁcant mechanical advantage during adjustment.

Under high load conditions (790) it is recommended that the loading arm be raised to approximately 45° above horizontal.

Under low load conditions it is possible to adjust the spring torque without raising/supporting the loading arm.

Torque

For more lifting action increase torque.

For less lifting action decrease torque.

1. Raise loading arm to highest position and secure.

2. Hold Adjusting Nut of Spring Regulator [2] with a large wrench.

3. Loosen lower Bolt of Spring Keeper and remove upper one.

Using a large screwdriver push Spring Keeper forward. With

Spring Keeper disengaged turn Spring Regulator Adjusting Nut

clockwise for more or counter clockwise for less torque.

4. With spring tension in desired position press Spring Keeper back

into position on Spring Regulator. While holding Spring Regulator

Adjusting Nut, tighten Spring Keeper Bolts [3]. Be sure Lock

Washers [4] are in place.

5. Minor adjustment can be achieved by turning the Spring Keeper

½ position. This is done by removing the 2 Keeper Bolts [3] and

turning the Spring Keeper end for end, so that the “teeth” of the

Spring Keeper will be reversed.

Downward

Loosen Jam Nut (located below lever arm) and

turn stop bolt in for more downward travel or

out for less downward travel. Then hold bolt

and tighten jam nut securely.

34 5

1231

19202122

a wholly-owned subsidiary of Dover Corporation.

www.opw-es.com

2726 Henkle Drive

Lebanon, Ohio 45036, USA

|Phone: (800) 547-9393

790 Series Counterbalance

Parts List: 788, 789 Series Counterbalance

Maintenance 788, 789, 790 Series

Lubrication

The torsion balance is provided with a self-lubricating Cylindrical Bearing. Only when operating

under severe conditions, a little oil may be applied to Bearing [7]. Pins [13] on Spring Arm [23]

and Link Arm [9] should have some oil quarterly.

No. Part No. Part

1Torsion Spring 13 Snubber Block

2Spring Regulator 14 Lock Washer

3 Bolt 15 Bolt

4Lock Washer 16 Bolt

5Spring Keeper

17 Nut

6Spring Arm 18 Screw

7 Lever 19 Cover (NOT SHOWN)

8 E-ring 20 Spring Compression

8 Pin 21 Snubber Retainer

10 Support Bracket 22 Snubber Plunger

11 Bearing Flange 23 E-ring

12 Side Support 24 Pin

DANGER Danger! Before performing any maintenance, always secure the Loading Arm and remove all tension from the counterbalance

-- a torsion spring. The Loading Arm counterbalance spring contains a substantial amount of stored energy. You must relieve

this energy before any disassembly. Failure to remove all tension from the counterbalance spring of the Loading Arm before

maintenance may cause serious personal injury or death.

WARNING WARNING! While installing and using the Loading Arm, always wear adequate personal protection, including hard hats, gloves,

and steel-toed work boots. Failure to wear adequate personal protection may cause serious personal injury or death.

WARNING WARNING! Always follow the procedures prescribed in this Document. Failing to follow the procedures prescribed may damage

the Loading Arm and cause serious personal injury or death. Consult Loading Arm Installation, Maintenance & Safety Manual for

more details.

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