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Only
Manitowoc
Published 05-16-17, Control # 233-03
2-23
999 SERVICE/MAINTENANCE MANUAL
HYDRAULIC SYSTEM
2
DISC BRAKE OPERATIONAL TEST
There is no physical way to check the disc brakes for travel,
boom hoist, front and rear drums, and swing; therefore, an
operational test of each brake must be performed weekly.
shows brake and brake solenoid valve locations.
Operational Test
NOTE:
For all pumps except swing, system pressure is
preset at 6,000 psi (414 bar). For swing pump,
system pressure is preset at 5,000 psi (345 bar).
Electrical plugs at brake solenoid valves must be
disconnected to stall crane functions during tests.
1.
Start engine and allow it to idle at 1,000 rpm.
2.
Select and confirm Standard mode.
NOTE:
For either load drum, make sure crane is in full
power mode (free fall
off
). The disc brake will
remain applied.
3.
Disconnect electrical plug for brake being checked.
4.
Scroll to corresponding diagnostics screen for brake
being checked. Monitor “pump pressure” and “pump
command” while moving control handles.
5.
For all functions, move control handle in both directions,
one at a time, to check brake operation in both
directions.
6.
Slowly move handle for function being checked.
Specified system pressure must be reached before 50%
pump command is reached and
brake must not slip
.
7.
Reconnect electrical plugs at all brake solenoid valves at
completion of operational test.
If disc brakes were repaired or replaced, retest brakes before
operating with a load.
SHOP PROCEDURES
This topic covers initial oil fill and hydraulic adjustments for
the hydraulic system and related components on the crane.
(See Figures
Experienced technicians, trained in the operation of this
crane and its hydraulic system, shall perform the shop
procedures. These technicians shall read, understand, and
comply with the instructions in this section.
Contact the Manitowoc Crane Care Lattice Team for a
detailed explanation of any procedure not fully understood.
All adjustments identified in this section were made to the
crane before it was shipped from the factory. Adjustments by
field personnel are required only when parts are replaced or
when instructed by the Manitowoc Crane Care Lattice Team.
Comply with the pressure and flow settings specified in this
section. Altering settings without the approval of the
Manitowoc Crane Care Lattice Team can damage crane
components or cause the crane to operate improperly.
Correct procedures for connecting hydraulic fittings are in
the
Item
Description
1
Load Drum Disc Brake (inside gearbox) (typical
front and rear drums)
2
Load Drum Motor Case Drain Port (typical front
and rear drums)
3
Load Drum Brake Solenoid Valve
4
Solenoid Valve Electrical Plug (typical front and
rear drums)
5
Swing Brake Solenoid Valve
6
Travel 2-Speed Solenoid Valve
7
Travel Brake Solenoid Valve (controls both travel
brakes)
8
Travel Motor (2 places)
9
Travel Motor Case Drain Port (typical both travel
motors)
10
Boom Hoist Brake Solenoid Valve
11
Boom Hoist Motor Case Drain Port
12
Boom Hoist Motor
13
Swing Brake
14
Swing Motor
15
Swing Motor Case Drain Port
CAUTION
Overheat Hazard!
Do not hold any function on stall for more than 5 seconds.
Damage to system components may occur.
WARNING
Falling Load/Moving Crane Hazard!
If any disc brake slips when operational test is performed,
repair or replace corresponding brake before placing
crane back into service. Loads could fall or crane could
move if brakes are not operating properly.
For load drums with a disc brake on both ends of drum,
repair or replace both disc brakes.
See planetary manufacturer’s manual for disc brake
repair instructions.
Summary of Contents for 999
Page 1: ...R e f e r e n c e O n l y Service Maintenance Manual Manitowoc 999 ...
Page 2: ...R e f e r e n c e O n l y ...
Page 4: ...R e f e r e n c e O n l y THE ORIGINAL LANGUAGE OF THIS PUBLICATION IS ENGLISH ...
Page 297: ...R e f e r e n c e O n l y ...
Page 298: ...R e f e r e n c e O n l y ...