Mda 5, Mda 7 And Mda 10 - Bosch Rexroth Hagglunds CA Series Installation & Maintenance Manual

50/76 Hägglunds CA Radial piston hydraulic motor | Installation
Bosch Rexroth AB, Version 11.2019, RE 15305-WA
7.4.8 MDA 5, MDA 7 and MDA 10
Disassembly
1. Start the disassembly by slightly loosening the screws (40). Not more than
one turn each. Continue with one turn of each screw around the cover until
the preload of the belleville springs (315)(cup springs) is zero. After that the
screws can be removed and the brake cover (314) lifted off.
2. The brake piston (313) can be removed by installing a M12 screw in the centre
hole and lifted off by using the screw.
3. Inner and outer discs (318, 320) can be removed and the screws (43) holding
the spacer (3xx) in place can be removed.
4. Loosen the screws (52) holding the disc centre (302) in place.
Assembly
1. Clean the unpainted area of the outside of the motor and the internal splines
of the cylinder block.
2. Unless the motor already is equipped with the correct seal and seal retainer
(25), replace the seal retainer with the one that is delivered with the MDA
brake.
The seal retainer(25) shall be assembled in the motor with the radial lip seal
facing out.
3. Lubricate the o-ring below the splines on the outside of the connection block
Apply a thin layer of corrosion protection, Shell Ensis or similar, on the top
4.
surface of the cylinder block and connection block.
Falling disc center
Risk of injury.
▶ Keep fingers away from underneath disc centre
5. Mount the disc centre (302) on the cylinder block, align the boltholes in the
disc centre (302) with the threaded holes in the cylinderblock.
Oil the screws (52) and assemble with lock washers, torque crosswise to
136 Nm (100 lb·ft).
6. Apply grease to hold the two o-rings in place in the grooves on the brake
housing (305), turn the brake housing (305) so that the o-rings are sealing
around the F3 and F4 ports of the motor. Mount the brake housing (305).
Oil the screws (43) and assemble with washers, torque 136 Nm (100 lb·ft).
7.
8. Place the correct spacer (3xx) inside the brake housing (305). See Table 18.
Mount the discs, start with an outer steel disc and alternate inner friction
9.
discs with outer steel discs until the correct number of discs are reached for
the brake size. See Table 18. Always end with an outer steel disc.
10. Grease the piston seal and guide strip with multi-purpose grease without solid
additives. Mount the brake piston (313) in the brake housing (305), tap it in
place with a plastic hammer. Remove one of the plugs in B1-B4 connection to
evacuate the air during assembly see Fig. 47.
CAUTION