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Dynamic Brake
Component Identification
Accumulator (HA0092)
• Pressure 870psi (60 bar)
Brake Pedal (HA0019)
T:
Tank Return Line (M16x1.5)
BR1:
Dynamic Brake Port (to 4 hydrostatic
motor) (M16x1.5)
SP1:
Accumulator & S1 Block HA0020 (M16x1.5)
SP2:
X1 Transmission Pump Port (M16x1.5)
M2:
Tank Return Line (M16x1.5)
EA0718: Pressure Switch 217psi (15 bar)
Function Description
The inching-remotely powered brake valve is a combination of a single circuit brake valve (3-way pressure reducing valve)
and an inching valve (2-way pressure reducing valve) with step-less operation.
The valve basically comprises of the housing (1), brake control spool (2)
inching spool (7), force spring (3), compression spring (8), plunger (4),
inching pressure limiting spring (6), and inching pressure control spring
(10).
The valve is normally operated via a foot pedal which moves the
plunger (4). This pushes against the force spring (3) and acts via the rod
(5) on the inching pressure control spring (10) together with the
inching pressure against the inching pressure control spring (6).
An increase in operation causes the control pressure to fall, the travel
pump swivels back and hydro-statically brakes the vehicle.
From a specific point the plunger acts on the compression spring (8). This moves the brake control spool (2) and the
connection to tank is closed. The flow from the accumulator to the brake cylinder is enabled. The increasing brake pressure
acts on the revers side of the brake spool (2). The control spool controls the brake pressure in relation tot he operation.
A pedal travel limitation acts as a maximum pressure limiter for the secondary circuit (brake pressure).
3 - Hydraulics
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