7
Installation and Maintenance Manual, Compact CA
3.1.7 Brake MDA
Installation
The brake is of the fail safe multi disc type. During normal operation hydraulic pressure keeps the
discs within the brake separated, allowing shaft rotation. If hydraulic pressure is lost, springs force
the discs together, stopping rotation of the shaft. The brakes are designed to operate on conven-
tional petroleum based hydaulic oils. Fire resistant fluids HFB and HFC are not allowed.
- The hydralic connection must be on top of the
brake, to avoid air. Air gives a slow function
for the brake.
If the brake is used in cold
environment as emergency
brake, it must be flushed.
* Valid at wet running. Friction coefficient
µ
= 0,1. Pressure in Brakecylinder = 0 bar. Hydraulic oil with AW-additives.
** See diagram 3.1 on page 7. High pressure reduce service life for seals and axial bearing.
-
The brakes are fatigue resistant for a
braking force corresponding to 67% of
braking torque.
-
The brake is fatigue resistant for a brake
release pressure of 25 bar (360 psi).
- The brake is intended to be used as a parking
brake or emergency brake.
- To be used as emergency brake for hanging
loads, the brake must be closed very
quickly.
Fig. 3.19
Fig. 3.20
3.1.8 Brake MDA 5, 7 & 10
B1 and B2
Brake
Motor
Braking
torque*
Begins
to open
at**
Fully
open
at**
Rec. opening
pressure
Displ.
Max allowed
pressure
Weight
Nm (lbf·ft) bar (psi) bar (psi)
bar (psi)
cm3 (in3)
bar (psi)
kg (lbs)
MDA 5
CA 50
1 900
(16 100)
16
(30)
19
(75)
0-5
(75-350)
96
(5,9)
50
(75)
100
(0)
MDA 7
CA 70
9 500
(1 700)
16
(30)
19
(75)
0-5
(75-350)
134
(8,)
50
(75)
100
(0)
MDA 10
CA 100
CA 140
CA 10
39 500
(9 100)
16
(30)
19
(75)
0-5
(75-350)
19
(11,7)
50
(75)
100
(0)
Max allowed pressure
50 bar (750 psi).