Maintenance; Description; Theory Of Operation; Warm-Up Procedure - Manitowoc Grove TMS800E Service And Maintenance Manual

TMS800E SERVICE MANUAL
TABLE OF CONTENTS
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Warm-up Procedure . . . . . . . . . . . . . . . . . . . . . . . 5-1

Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Functional Check . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
Hoist to Boom Alignment. . . . . . . . . . . . . . . . . . . . 5-4
Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
Piston Motor And Control Valve . . . . . . . . . . . . . . 5-6
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6

DESCRIPTION

One standard hoist is available for both the main and
auxiliary; the HP30A (see Figure 5-1). The hoist incorporates
one dual 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. An overrunning clutch allows the
hoist to be raised without releasing the brake while at the
same time holding the load until there is sufficient pressure to
release the brake when hoisting down. The hoist motor
controls both speed and torque of the hoist.
There are two modes in which the hoist operates. One mode
is high speed. The pilot solenoid valve shifts the selector
spool on the motor to provide minimum motor displacement.
This gives high line speed and low torque.
The second mode is low speed. The pilot solenoid valve
shifts the selector spool on the motor to provide maximum
motor displacement. This gives low line speeds and high
torque.
THEORY OF OPERATION
The hoist assembly is controlled by controllers located in the
cab. When the control lever in the cab is moved from neutral,
it causes the main hoist section of the directional control
valve to shift the valve spool to route hydraulic flow to the
hoist motor control valve. The hoist motor control valve is
GROVE
SECTION 5
HOIST AND COUNTERWEIGHT
Idler Drum and Cable Follower. . . . . . . . . . . . . . . . 5-7
Hoist Drum Indicator System . . . . . . . . . . . . . . . . 5-10
Hoist Control Valves . . . . . . . . . . . . . . . . . . . . . . . 5-11
Counterweight . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11
used to stop or slow the hoist when the load is trying to drive
the hoist down too quickly. The motor control valve is piloted
open by the hoist down pressure. If the load lowers faster
than the flow of oil in the hoist down line, the pilot pressure
decreases and the motor control valve partially closes to
restrict the oil leaving the motor until a balance occurs. This
results in the load lowering at a uniform speed based on the
position of the hoist control lever.
During stopping, when the hoist down flow ceases, the pilot
pressure holding the motor control valve open decays to
zero and the motor control valve spool closes, thus blocking
all flow of oil out of the hoist motor. This same pressure
decay allows the spring applied pressure released hoist
brake to apply when the load is fully stopped. This brake acts
as a "parking brake" and holds the load in the stopped
position.
NOTE:
MAINTENANCE
Warm-up Procedure
A warm-up procedure is recommended at each start-up and
is essential at ambient temperatures below 4°C (+40°F).
The prime mover should be run at its lowest recommended
RPM with the hydraulic hoist control valve in neutral allowing
sufficient time to warm up the system. The hoist should then
Published 01-29-2014, Control # 496-00
HOIST AND COUNTERWEIGHT
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11
Mounting the Counterweight . . . . . . . . . . . . . . . . 5-11
Stowing the Counterweight . . . . . . . . . . . . . . . . . 5-12
For more detailed information on the hoist, refer to
the Shop Reference and Maintenance Guide.
5
5-1