Wacker Neuson RD 16, Operator'S Manual, Page: 86 / 244

Maintenance RD 16
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4.23 Manually Releasing Parking Brake
See Graphic: wc_gr002964
There are two drive motors on the roller—one on each drum. Each
drive motor includes a parking brake that is spring activated and
hydraulically released (SAHR).
NOTICE: To avoid damaging the internal mechanism, do not use
power tools to release or reactivate the brakes.
To manually release the brakes:
Note: Carry out the procedure on both drums.
4.23.1 Chock each drum to prevent the machine from moving.
4.23.2 Lock the articulated steering joint. See section Articulation Joint
Lockarm.
4.23.3 Using an 8mm Allen wrench, remove the plugs (a) in order to access
the release screws (b) .
4.23.4 Using a 6mm Allen wrench, press and turn each release screw in until
its threads catch in the brake plate
(d) . Tighten each release screw
alternately until the spring (c) on each is fully compressed. You will feel
a substantial difference in the amount of torque required to turn the
screw once its spring is fully compressed.
4.23.5 Continue to tighten (turn clockwise) the two release screws to
compress the brake plate springs. Alternate back-and-forth between
the two screws, turning approximately 45° at a time, until the drums are
no longer held by the brake plate. The brake plate should release after
turning each screw approximately two (2) turns.
NOTICE: Maximum torque for the release screws is 33 Nm (24.3
ft.lbs.). Overtightening the release screws can destroy the internal
mechanism.
4.23.6 Manually turn the drum to test if the brake is released.
4.23.7 Replace the plugs, tightening them to a maximum torque of 60 ± 6 Nm
(44.2 ± 4.4 ft.lbs.).
To reactivate the brakes, carry out the following procedure on both
drums.
4.23.8 Remove the plugs (a) .
4.23.9 Alternating between the two release screws (b), completely loosen
them until the brake plate is disengaged.
4.23.10 Replace the plugs, tightening them to a maximum torque of 60 ± 6 Nm
(44.2 ± 4.4 ft.lbs.).
Note: After repair, ensure that the releasing screws are back in the
normal operating postiion.