Hägglunds Compact CA - Mounting MDA 5, 7 & 10 Brakes

32
Installation and Maintenance Manual, Compact CA
3.1.11 Mounting MDA 5, 7 & 10
3.1.11 Reduction of brake torque
302
25
314
315
313
43
3xx
305
Figure 3.27
The brake is normally mounted on the motor
at the factory. If the brake is disassembled and
shall be mounted on a motor, it must be done
according to following.
1. Control that seal and Seal retainer (25) is
mounted according to figure 3.27.
2. Mount Disc centre (302) on the cylinder
block. Oil the screws (43) and assemble with
torque 136 Nm (100 lbf·ft).
3. Put the Brake housing (305) on the motor,
and mount the right spacer (3xx). Oil the
screws and mount them with tightening
torque 136 Nm (100 lbf·ft). See table 3.12.
4. Mount first one outer disc. Then mount inner
disc, outer disc until all discs are mounted.
The diagram 3.1 below shows the falling brak-
ing torque M
max
for increasing pressure in the
brake cylinder drain.
Example: MDA 10 has a dynamic braking
torque of 41500 ± 2000 Nm (30600 ± 1480
lbf·ft), when the brake is not under pressure.
Assume that the pressure in brake cylinder
drain is 1.5 bar / 21.75 psi. The diagram shows
that the actual brake torque (M
act
) corresponds
to only 90% of M
max
.
Motors with SPECIAL
brakes may have differ-
ent working operation.
Please make sure that
you check the Ordering
code on your brake.
Diagram 3.1
Installation
Back pressure in brake cylinder drainage line.
MDA5 has 6 outer discs and 5 inner discs.
MDA7 has 8 outer discs and 7 inner discs.
MDA10 has 11 outer discs and 10 inner discs.
% Braking torque
Brake Screws (ISO 89811) Spacer
MDA 5 MC6S 12x50 12.9 t=54 (2.13)
MDA 7 MC6S 12x50 12.9 t=42.4 (1.67)
MDA 10 MC6S 12x50 12.9 t=25 (0.98)
Grease with
Hylomar
Table 3.12
5. Grease the seals with Texaco multifak or an
equivalent grease without solid additives and
mount the piston (313).
6. Grease the springs (315) with MoS
2
Mo-
lykote or an equivalent grease. Put the
springs on the Brake cover (314). The
springs shall be mounted against each other
on the inner diameter.
7. Grease Brake cover, contact surface be-
tween Brake cover and Brake housing with
a thin layer of Hylomar. Mount Brake cover
(314) on the brake. Oil the screws and as-
semble the screws. Start mounting by slightly
tightening the screws, no more than 1 turn
each. Continue with one turn of each screw
around the cover. Tightening torque is 114
Nm (84 lbf·ft).