Manitowoc Grove RT9130E-2 Service And Maintenance Manual

2-48 Published 11-22-2016, Control # 345-12
HYDRAULIC SYSTEM RT9130E-2 SERVICE MANUAL
TANDEM BRAKE VALVE W/ TREADLE
PEDAL
Description
The tandem brake valve with treadle pedal Figure 2-28 is
located on the floor of the cab. The tandem brake valve
provides split system braking for the primary (front) brakes
and the secondary (rear) brakes. The valve is a closed
center spool design which modulates the output pressure
2100 psi ±75 (14,483 kPa ±517) to the brake actuators.
The valve is mechanically actuated by a treadle pedal. The
direct acting spool provides a pedal feel which accurately
represents the brake pressure, similar to automotive style
pedal feedback as the brake pedal pressure increases, the
pedal effort increases proportionally.
As the pedal is initially actuated, the tank ports are closed off
from the brake ports. With further application of the pedal,
the pressure ports are opened to the brake ports until the
pedal actuation force and the hydraulic pressure force are
balanced. Also when the pedal is actuated, the integral
proximity switch is engaged to provide an electrical signal for
brake lights. When the pedal is released, the valve and the
pedal return to the non-applied position. In normal operation,
the secondary system is piloted from the primary section
providing pressure to both systems.
The tandem brake valve consists of a tandem valve body, a
closed center spool, a treadle pedal, an integral proximity
switch and a mechanical spring assembly to limit the output
pressure to the brake actuators to 2100 psi ±75 (14,483 kPa
±517).
Maintenance
Removal
1. Tag and disconnect the electrical connector to the valve.
2. Tag and disconnect the hydraulic hoses from the valve.
Cap or plug the lines and ports.
3. Remove the nuts and bolts securing the valve to the cab
floor. Remove the valve.
Installation
1. Secure the valve to the cab floor with the nuts and bolts.
2. Connect the hydraulic hoses to the ports on the valve as
tagged during removal.
3. Connect the electrical connector to the valve as tagged
during removal.
4. Start the engine and check valve and hoses for leaks.
Make repairs as needed.
5
6703
6703-1
FIGURE 2-28
6
1
2
3
4
1
2
3
4
5
6
Item Description
1 P1 - Pressure port
2 Tank Port
3 P2 - Pressure Port
Item Description
4 Tank Port
5 Port B1 - Front Disc Brakes
6 Port B2 - Rear Disc Brakes

Manitowoc Grove RT9130E-2 Specifications

General

Brand	Manitowoc
Model	Grove RT9130E-2
Category	Construction Equipment
Language	English