Dover TWG RUFNEK 50P, Service & Repair Manual

18

DRUM SECTION ASSEMBLY 

1.

After inspecting and replacing the necessary parts, such as the drum bushings (31), install the 
bushing (4) onto the output shaft (40-9).  

2.

Install the drum (34) onto the output shaft (40-9).  This part is very heavy and you will need the 

assistance of a hoist.  With the weight of the drum supported, install the brake band assembly 
(66) and the capscrews (70), nuts (71), and washers (72). 

You may need to lower the drum to align the holes in the brake 
band with the holes in the frame.

3.

Install the brake band air cylinder (68) making sure the rod of the air cylinder is going through 

the bracket on the brake band (66).  Secure it to the bracket with the clevis pin (99) and cotter 

pin (100).  Tighten the adjusting nut on the air cylinder shaft until there is no space between the 
drum (34) and the brake band (66).  Then, tighten the jam nut to secure the adjusting nut.

The brake band may need to be readjusted once it’s in the field. 

4.

Install the bushing (4) onto the output shaft (40-9).  Install the inner thrust collar (24) making 

sure the half-moon slots are lined up with the key slots in the output shaft (40-9).  Tap the two 

keys (94) into their slots in the output shaft. 

 
5.

If necessary, install the new drum clutch (28) using six capscrews (33).  Torque to specified 

torque (see page 25 of this manual).  Then, align the coupler (30) with the keys (94) and slide it 

onto the output shaft (40-9).  Install the sliding clutch (27) onto the coupler (30).  Then install 

the yoke (87) onto the sliding clutch (27). 

 
6.

Install the outer thrust collar (105), aligning the half-moon slots with the keys (94).  Tightly hold 

the thrust collar (105) against the keys and lock down the three set screws (89). 

7.

Install the oil seal (25) onto the output shaft (40-9). 

8.

Slide the brake housing (20) onto the output shaft (40-9). 

9.

Bolt the brake housing (20) loosely into both frames (64, 65) using four capscrews, washers, and 
nuts (61, 62, & 63)

.  Lower the drum so the weight of the drum is supported by both the brake 

and gear housings.  The air line from the brake band air cylinder can be attached at this time. 

10.

Disengage the sliding clutch (27) so you can turn the drum freely and tighten all bolts 

throughout the frames to the proper torque specification (see page 25 of this manual). 

11.

Turn the drum to make sure it is not binding. 

12.

Install the air cylinder (67) and the air cylinder cover (91) to the brake housing with four 
capscrews (69) and spacers (97). 

13.

Install the bracket (101) to the brake housing using four capscrews (90).