Milnor 72044SR2, Mechanical Parts And Service, Page: 50 / 175

48
Pellerin Milnor Corporation
1. Adjust for maximum rod travel.
a. Operate the master switch to energize control power.
b. Make sure that the air pressure that releases the brake ( Figure 24: A Typical First and Sec-
ond Brake on a Divided Cylinder Machine, page 49 , item 1) is 85 -100 PSI (5.95 - 07.0
kg/cm-cm).
c. Make sure that the nuts that lock the rods together ( Figure 22 , item 5) are loose.
d. Release the brake (see Section : Operation of Brake Systems, page 48 ). Let the air cylin-
der rod fully retract into the air cylinder as shown in Figure 23 , item A.
e. Turn the brake rod into the air cylinder rod until the brake rod comes out of the brake cyl-
inder fully. See Figure 23 , item B.
f. Lock the brake rod ( Figure 22 , item 2) to the air cylinder rod ( Figure 22 , item 3) with
two nuts ( Figure 22 , item 5).
2. Make sure that the brake will continue to operate while the pads wear.
a. Release the brake. On the view slot, put a mark at the position of the lock nuts. ( Figure 23
, item M1).
b. Apply the brake. See Section : Operation of Brake Systems, page 48 .
c. Put a mark at the position of the lock nuts when the brake is applied. This can be at posi-
tion M2a, M2b, or between M2a and M2b. When the pads wear, this position will move.
d. Make sure that the distance the rod moves when you apply the brake is 0.75 to 1.0 inches
(19-25 mm). If the travel is more than this, the brake piston can hit the mechanical stop
before the brake engages fully. This condition is shown in
Figure 23 , item E (dimension
TT).
Operation of Brake Systems
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Look at the electrical schematics of your machine to find how your brake is controlled. Some ma-
chines release the brake when you close the door. Some machines have a control relay to release
or apply the brake.
How to Apply the Brake for Machines with a "Break Release" Output
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1. Turn the "brake release" control output off to de-energize the air valve to remove air pressure
to the air cylinder ( Figure 18: A typical hydraulic brake system, page 38 , item 1).
2. With no air pressure, a spring in the air cylinder will apply force to the hydraulic cylinder
( Figure 18: A typical hydraulic brake system, page 38 , item 8). This will apply pressure to
the brake pads ( Figure 19: The Caliper Components, page 42 , item 4) against the rotor disk
( Figure 18: A typical hydraulic brake system, page 38 , item 5). ( Figure 23: The Adjustment
between the Brake Rod and the Air Cylinder, page 47 , item C,D)
NOTE:
If electrical power or compressed air is missing, hydraulic pressure will ap-
ply the brake.
Drive Assemblies