Maintenance - Manitowoc Grove RT770E Service Maintenance Manual

HYDRAULIC SYSTEM
Item
1 Port T - Tank
Port P - Pressure from High Speed Boost
2
Selector Valve
3 Port GP - Gauge Port
4 Port OA - Solenoid Valve SV2 - Jack Cylinders
Port OB - Solenoid Valve SV1 - Extension
5
Cylinders
Port SA - Solenoid Valve SV5 - Rear Steer
6
Cylinders
Port SB - Solenoid Valve SV4 - Rear Steer
7
Cylinders
Solenoid Valve SV3 from High Speed Boost
8
Selector Valve

Maintenance

Removal
1. Tag and disconnect the electrical connectors to the
valve. Tape the lead ends.
2. Tag and disconnect the hydraulic lines to the valve. Cap
or plug the lines and ports.
2-48
Description
Published 11/26/2014, Control # 447-05
3. Remove the capscrews, nuts, and washers securing the
valve to the frame. Remove the valve as a complete
assembly.
Installation
1. Install the integrated outrigger/rear steer valve to the
f r a m e . S e c u r e t h e v a l v e w i t h t h e f l a t w a s h e r s ,
l o c k w a s h e r s , h e x n u ts a n d c a ps c r e w s . To r q u e
capscrews; refer to Fasteners and Torque Values, page
1-16 for proper torque value.
2. Connect the hydraulic lines to the integrated outrigger/
rear steer valve as tagged during removal.
3. Connect the electrical connectors to the integrated
outrigger/rear steer valve as tagged during removal.
Functional Check
1. Cycle an outrigger cylinder several times. Verify the
cylinder extends and retracts properly.
2. Rear steer the crane to the left and to the right several
times. Verify the crane steers properly in both directions.
RT770E