Manitowoc 2250 Service Maintenance Manual

Reference Only
HYDRAULIC AND AIR SYSTEMS 2250 SERVICE/MAINTENANCE MANUAL
2-14
Published 07-19-16, Control # 249-01
DISC BRAKE OPERATIONAL TEST
General
There is no physical way to check the disc brakes for travel,
boom hoist, luffing hoist, front/rear drums, and swing. An
operational test of each brake must be performed weekly.
See Figure 2-17
for brake and brake solenoid valve
locations.
Operational Test
NOTE: For all pumps, the system pressure is preset at 379
to 448 bar (5,500 to 6,500 psi).
The electrical plugs at the brake solenoid valves must be
disconnected to stall crane functions during tests.
1. Start the engine and allow it to idle at 1,500 rpm.
2. Select and confirm SETUP mode (faulty pressures will
be recorded in any other mode).
NOTE: For load drums, make sure the crane is in Full
Power mode.
3. Disconnect the electrical plug for the brake being
checked.
4. Scroll to the corresponding diagnostics screen for the
brake being checked. Monitor PUMP PRESSURE and
PUMP COMMAND while moving the control handles.
5. For all functions, move the control handle in both
directions, one at a time, to check brake operation in
both directions.
6. Slowly move the handle for the function being checked.
The specified system pressure must be reached before
50% pump command is reached, and the brake must not
slip.
7. Reconnect the electrical plugs at all brake solenoid
valves at the completion of operational tests.
8. If disc brakes were repaired or replaced, retest the
brakes before operating with a load.
CAUTION
Overheating Hazard!
Avoid equipment damage due to overheating system
components.
Do not hold any function on stall for more than 10
seconds.
WARNING
Falling Load/Moving Crane Hazard!
Avoid death or serious injury. Loads could fall or the crane
could move if the brakes are not operating properly.
If any disc brake slips when an operational test is
performed, repair or replace the corresponding brake
before placing the crane back into service. For load drums
with a disc brake on both ends of the drum, repair or
replace both disc brakes.
See the planetary manufacturer’s manual for disc brake
repair instructions.
Legend for Figure 2-17
Item
Description
1 Travel Disc Brake Solenoid Valve (both brakes)
2 Luffing Hoist Disc Brake Solenoid Valve
3 Swing Disc Brake Solenoid Valve
4 Luffing Hoist Disc Brake
5 Luffing Hoist Planetary
6 Case Drain Port
7 Swing Brake (disc)
8 Swing Planetary
9 Front Drum Disc Brake Solenoid Valve
10 Right Rear Drum Disc Brake Solenoid Valve
11 Left Rear Drum Disc Brake Solenoid Valve
12 Load Drum Planetary
13 Case Drain Port
14 Travel Disc Brake (qty 2)
15 Case Drain Port (qty 2)
16 Crawler Input Planetary (qty 2)
17 Boom Hoist Planetary
18 Boom Hoist Disc Brake
19 Case Drain Port
20 Boom Hoist Brake Solenoid Valve
21 Electrical Plug (typical)
22 Boom Hoist Planetary Fill Sight Gauge

Manitowoc 2250 Specifications

General

Brand	Manitowoc
Model	2250
Category	Construction Equipment
Language	English