Swing Power Brake Valve With Treadle Pedal; Description; Maintenance - Manitowoc Grove RT880E Service And Maintenance Manual

RT880E SERVICE MANUAL
SWING POWER BRAKE VALVE WITH
TREADLE PEDAL

Description

The swing power brake valve is used to provide hydraulic
pressure to the piston of the swing brake to apply the brake.
The valve receives its supply of oil from the front steer and
accessory manifold. Depressing the brake pedal causes
hydraulic oil to flow to the top of the brake piston where,
combined with spring tension, the total force overcomes the
brake release pressure and applies the brake. When the
valve is released, excess hydraulic oil flows from the valve to
the case drain manifold and back to the reservoir (see
Figure 2-26).

Maintenance

Removal
1. Tag and disconnect hydraulic lines attached to the brake
valve. Cap or plug the lines and ports.
2. Remove the three bolts, spring lockwashers, flat
washers, and nuts which secure the brake valve to the
cab floor. Remove the brake valve.
Installation
DANGER
Engage the swing lock before installing the swing brake
valve.
Item

Description

1 A Port - To Swing Drive
2 T Port - To Reservoir
3 P Port - Pressure From Swing, Steer and
Accessory Manifold
1
Grove
3
2
Published 11-10-2014, Control # 524-00
1. Engage the swing lock.
2. Install the brake valve and secure in place with the three
bolts, flat washers, spring lockwashers, and nuts. Torque
bolts; refer to Fasteners and Torque Values, page 1-15
for proper torque value.
3. Attach the hydraulic lines to the brake valve as tagged
during removal.
Function Check
1. Start the engine and let it idle.
2. Disengage the swing lock.
3. Slowly swing the turntable.
DANGER
Engage the swing lock before adjusting the swing brake
valve.
4. Test the valve by engaging the swing brake control valve
and operating the swing brake. Verify the swing brake
works when the pedal is pressed. Verify the brake is off
when the pedal is not pressed. Engage the swing lock
and make adjustments to the pedal as needed.
5. Check for leaks. Make repairs as needed.
2
HYDRAULIC SYSTEM
1
3
FIGURE 2-26
2-51
2