Manitowoc Grove GRT8100 Service Manual

6-17
Published 3/26/2018, Control # 596-05
GRT8100 SERVICE MANUAL SWING SYSTEM
6
GROVE
HYDRAULIC SWIVEL
Description
Each port on the spool and case of the swivel is stamped
with the port number. The function of each port is described
below.
Theory of Operation
The hydraulic swivel allows oil to flow from the pumps to
various crane functions on the superstructure. All oil is
routed into the spool portion of the swivel where, through a
series of internally drilled passages, oil is transferred to
circumferential channels on the spool exterior. These
channels correspond with a mating port on the outer case of
the swivel. Each channel is separated by a series of nylon
and O-ring seals that prevent transfer of oil and pressure.
Return flow from the crane superstructure is accomplished in
the same manner through another set of ports.
Maintenance
Removal
1. Extend and set outriggers. Ensure crane is level and
boom is over the front.
2. Elevate boom and note at what boom angle, you have
the most clearance between the lift cylinder and the
turntable side plate. Shut down engine.
3. Measure distance from top of lift cylinder to base of
boom section where lift cylinder attaches. Cut two pieces
of 10 x 10 cm (4 x 4 in) oak to fit.
NOTE: It may be necessary to raise boom slightly to allow
installation of blocking.
NOTE: This blocking is to add extra support for the boom.
Any seepage or leakage in the holding valves or
internally in the cylinders will allow the boom to
settle over a period of time.
4. Use oak blocking to block between barrel of lift cylinder
and boom base section.
5. Tag and disconnect hydraulic lines from case of
hydraulic swivel. Cap or plug all lines and openings.
6. Tag and disconnect the hydraulic lines and water lines
from the spool of the hydraulic swivel. Cap or plug all
lines and openings.
7. Tag and disconnect water lines from case of water
swivel. Cap or plug all lines and openings.
8. Disconnect swivel wiring harness connectors from
carrier receptacles and yellow ground wire from
Port #
Test Pressure
Bar (psi)
Function
1 35 (100) Return
1 35 (100) Return
2 330 (4790) Supply
3 330 (4790) Supply
4 4 (50) Drain
5 270 (3920) Swing
6 170 (2500) Steer Left
7 170 (2500) Steer Right
8 306 (4436) Load Sense
9 145 (2100) Brakes Front
10 145 (2100) Brakes Rear
11 2 (30) A/C Supply
12 2 (30) A/C Return
A 2 (30) Heater
B 2 (30) Heater

Manitowoc Grove GRT8100 Specifications

General

Brand	Manitowoc
Model	Grove GRT8100
Category	Construction Equipment
Language	English