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5-1
GRT9165 SERVICE MANUAL
HOIST AND COUNTERWEIGHT
5
Published 10-01-2020 Control # 699-00
GROVE
SECTION 5
HOIST AND COUNTERWEIGHT
SECTION CONTENTS
Hoist Description . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Hoist Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Removing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Functional Check . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
Hoist Fluid Level Check . . . . . . . . . . . . . . . . . . . . 5-3
Usage and Inspection . . . . . . . . . . . . . . . . . . . . . . 5-6
Preventative Maintenance . . . . . . . . . . . . . . . . . . . 5-6
Hoist Oil Sampling . . . . . . . . . . . . . . . . . . . . . . . . . 5-7
Brake Test Procedure . . . . . . . . . . . . . . . . . . . . . . 5-8
Hoist Motor, Motor Control Valve, And Brake . . . 5-8
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8
Hoist Rotation and 3rd Wrap Indicator System . . 5-8
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9
Hoist Control Valves . . . . . . . . . . . . . . . . . . . . . . . 5-10
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10
Removable Counterweight . . . . . . . . . . . . . . . . . 5-10
HOIST DESCRIPTION
One standard hoist is available for both the main and
auxiliary (Figure 5-1). The hoist incorporates one single
displacement piston motor which drives a reduction unit
within the hoist. The hoist utilizes planetary reduction with a
multi-disc automatic brake that is spring applied and
hydraulically released. The hoist motor controls both speed
and torque of the hoist.
THEORY OF OPERATION
Flow from pump number one and two is routed through the
swivel to the directional control valve bank.
When the main hoist joystick in the cab is moved from
neutral, it sends an electrically controlled signal to the main
hoist directional control valve to shift the valve spool to route
hydraulic flow to the hoist motor or motor control valve.
When the auxiliary hoist joystick in the cab is moved from
neutral, it sends an electrically controlled signal to the
auxiliary hoist directional control valve to shift the valve spool
to route hydraulic flow to the hoist motor or motor control
valve.
Summary of Contents for Grove GRT9165
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