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891 Series Loading-Arm Counterbalance

The 891 Series Hi-Load Counterbalance represents the  
best available technology in loading-arm counterbalancing. 
Today’s applications demand higher spring loads to  
accommodate longer reaches and additional equipment  
that is commonly specified on loading arms. The 891 delivers 
by providing roughly 50% more spring capacity than our  
previous counterbalance model.

Benefits

•  

Easy, Precise Adjustment – 

A simple turn of the adjustment 

bolt provides finite adjustment to tune your loading arm to 
the desired balance point.

•  

No Special Tools Required – 

Standard socket wrench 

•  

Wide Range of Motion – 

80° of motion  

(55° up and 25° down)

•  

Stable Balancing – 

Through the entire range of motion

•  

Integral Upward & Downward Travel Stops –  

Fully adjustable to limit the range to your application

•  

Safe, Robust Design – 

Tested under full-load conditions  

for more than 100,000 cycles with no degradation in  
performance

Specifications

•  

Type – 

Right-Hand/Left-Hand Hi-Load Loading Arm Counterbalance

•  

Working Temperature Range –  

-50° F to +176° F  

(-46° C to +80° C)

Selection Guide

ENGINEERING

891 D - 48RH - LT

891

 = Series

D

 = 13–16K

E

 = 16–19K

Swivel  

Size

3

 = 3"

4

 = 4"

6

 = 6"

Swivel 

Series

3

 = 3000

8

 = 8000

Low 

Temperature

RH

 = Right-Handed

LH

 = Left-Handed

IMPORTANT:

 OPW products should be used in compliance 

with applicable federal, state, provincial, and local laws and 
regulations. Product selection should be based on physical 
specifications and limitations and compatibility with the  
environment and materials to be handled. OPW MAKES  
NO WARRANTY OF FITNESS FOR A PARTICULAR USE.  
All illustrations and specifications in this literature are based  
on the latest product information available at the time of  
publication. OPW reserves the right to make changes at any 
time in prices, materials, specifications and models, and to 
discontinue models without notice or obligation.

opw-es.com

891 Series  
Counterbalance

Summary of Contents for OPW 891 Series

Page 1: ...ll load conditions for more than 100 000 cycles with no degradation in performance Specifications Type Right Hand Left Hand Hi Load Loading Arm Counterbalance Working Temperature Range 50 F to 176 F 46 C to 80 C Selection Guide ENGINEERING 891 D 48RH LT 891 Series D 13 16K E 16 19K Swivel Size 3 3 4 4 6 6 Swivel Series 3 3000 8 8000 Low Temperature RH Right Handed LH Left Handed IMPORTANT OPW prod...

Page 2: ...pring Arm 890 HLTS BRZ C 21405 M C 21405 M C 21405 M C 21405 M 8 1 Torsion Spring Spring Coil Color C 21465 M White C 21466 M Black C 21406 M Blue C 21407 M Green 9 1 Nameplate 890 HLTS Alum C 21495 M C 21495 M C 21495 M C 21495 M 10 1 Link Arm DI E 20041 DI E 20041 DI E 20041 DI E 20041 DI 11 4 Screw Hex Cap CST ZP 5 8 11 x 1 1 4 H 33183 M H 33183 M H 33183 M H 33183 M 12 2 Grease Fitting SST 1 4...

Page 3: ...se loading arm vertical travel or to slow the rate at which the arm rises DECREASE torque Note Prior to any adjustment loading arm should be raised and secured in highest possible position preferrably 45 Place 1 1 16 socket wrench on ADJUSTMENT BOLT To INCREASE torque rotate ADJUSTMENT BOLT clockwise To DECREASE torque rotate the ADJUSTMENT BOLT counter clockwise Release wrench and test loading ar...

Page 4: ...he 891 Spring 1 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 and death 2 Always follow the procedures prescribed in this document Failing to follow the procedures prescribed may damage the Loading Arm and cause serious personal i...

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