Manitowoc Grove RT770E Service Maintenance Manual

8-1
RT770E UNDERCARRIAGE
8
Published 11/26/2014, Control # 447-05
GROVE
SECTION 8
UNDERCARRIAGE
SECTION CONTENTS
Axles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2
Wheels And Tires . . . . . . . . . . . . . . . . . . . . . . . . . 8-4
Typical Wear Patterns. . . . . . . . . . . . . . . . . . . . . . 8-4
Steering Systems . . . . . . . . . . . . . . . . . . . . . . . . . . 8-7
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-7
Theory Of Operation . . . . . . . . . . . . . . . . . . . . . . . 8-7
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-8
Rear Steering System. . . . . . . . . . . . . . . . . . . . . . . 8-9
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . 8-9
Hydraulic Pumps. . . . . . . . . . . . . . . . . . . . . . . . . 8-10
Front Steering Control Valve. . . . . . . . . . . . . . . . 8-10
Integrated Outrigger/Rear Steer Control Valve. . 8-10
Steer Cylinders . . . . . . . . . . . . . . . . . . . . . . . . . . 8-10
Rear Axle Oscillation Lockout System . . . . . . . . 8-11
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-11
Theory Of Operation . . . . . . . . . . . . . . . . . . . . . . 8-11
Axle Oscillation Lockout Cylinders . . . . . . . . . . . 8-13
Axle Oscillation Lockout Valve . . . . . . . . . . . . . . 8-13
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-13
Brake System . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-13
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-13
Theory Of Operation . . . . . . . . . . . . . . . . . . . . . . 8-14
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-15
Service Brakes. . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-16
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-16
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-16
Corrosion Protection . . . . . . . . . . . . . . . . . . . . . . 8-20
Parking Brake Actuator. . . . . . . . . . . . . . . . . . . . . 8-22
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-22
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-22
Parking Brake . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-23
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-23
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-23
Park Brake Solenoid Valve . . . . . . . . . . . . . . . . . . 8-26
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-26
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-26
Outrigger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-26
Outrigger Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . 8-26
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-27
Outrigger Beam . . . . . . . . . . . . . . . . . . . . . . . . . . 8-30
Extension Cylinder. . . . . . . . . . . . . . . . . . . . . . . . 8-34
Outrigger Monitoring System (Optional—
Standard in North America) . . . . . . . . . . . . . . . . . 8-34
Jack Cylinder . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-35
Outrigger Control Valves . . . . . . . . . . . . . . . . . . . 8-36
AXLES
Description
To provide maximum maneuverability, both the front and rear
axles are steerable. The rear axle is mounted on a pivoting
cradle (fifth wheel) which allows the axle to oscillate while
traversing uneven terrain. The front axle is bolted directly to
the frame. All four wheels utilize a disc type hydraulic braking
system. A disc-type parking brake is mounted of the front
axle input shaft.
Each axle incorporates a single reduction carrier with hypoid
gearing mounted in the axle center. The final reduction is of
planetary design spur gearing built into the wheel hubs.
The design of these axles permits the hypoid gearing of the
differential carrier and the axle shafts to carry only a nominal
torsional load while at the same time providing the highest
practical numerical gear reduction at the wheels.
The hypoid pinion and differential assembly of the first
reduction are supported by tapered roller bearings. The
pinion bearing preload is adjusted and maintained by a
hardened precision spacer between the inner and outer
bearing. The differential tapered bearing preload is adjusted
and maintained by the positioning of the threaded adjusting
rings in the carrier leg and cap bores.
In the planetary wheel ends, the spur teeth of the sun gear
mesh with teeth of the planet spur gears. The planet spur
gears rotate on planet pins which are mounted in a spider.
The planet spur gear teeth in turn mesh with teeth of the
floating ring gear.
Power is transmitted by the hypoid gear set in the differential
carrier to the axle shafts and the sun gear of the final

Manitowoc Grove RT770E Specifications

General

Brand	Manitowoc
Model	Grove RT770E
Category	Construction Equipment
Language	English