Manitowoc 2250 Service And Maintenance Manual

Reference Only
Manitowoc Published 11-06-15, Control # 040-13 1-31
2250 SERVICE/MAINTENANCE MANUAL INTRODUCTION
1
Pressurized Air Supply
See Figure 1-14 for the following procedure.
Pressurized air is provided to the crane's air cylinder
systems — boom hoist pawl, luffing hoist pawl, load drum
pawls, load drum brakes, load drum clutches, counterweight
pin cylinders, back hitch pin cylinders, and optional boom
stop cushion cylinders. See Air Schematic drawing in
Section 5.
Airflow from compressor passes through air dryer before
entering air tanks. An optional alcohol injector provides de-
icing and condensation is eliminated through an electrical
moisture ejector.
Unloader valve adjusts compressor delivery rate by briefly
opening compressor's intake valve at 132 psi (9 bar). Safety
relief valve limits pressure in the system to 165 psi (11,4 bar).
Another shut-off valve isolates supply from air system.
Air tanks, filter, injector, ejector, and shut-off valve are
mounted on left side of rotating bed. Unloader valve and
relief valves are located on right side, near engine mounted
air compressor. Pressure sender monitors air pressure and
sends the information to the PC. Digital display indicates
supply pressure. If supply pressure drops to 90 psi (6 bar),
the PC enables an alert. Load drum brakes apply
automatically at 75 psi (5,2 bar).
Each air solenoid valve in this section is assigned an AS
number. The AS number identifies each air solenoid valve.
AS-1 Back Hitch Pins Extend
AS-2 Back Hitch Pins Retract
AS-3 Lower Counterweight Pins Engage
AS-4 Lower Counterweight Pins Disengage
AS-5 Upper Counterweight Pins Engage
AS-6 Upper Counterweight Pins Disengage
AS-7 Front (Drum 1) Brake
AS-8 Front (Drum 1) Clutch
AS-9 Right Rear or Rear (Drum 2) Brake
AS-10 Right Rear or Rear (Drum 2) Clutch
AS-11 Right (Drum 3) Brake
AS-12 Right (Drum 3) Clutch
AS-13 Boom Hoist Pawl Out
AS-14 Boom Hoist Pawl In
AS-15 Luffing Jib Pawl Out
AS-16 Luffing Jib Pawl In
AS-17 Front (Drum 1) Pawl Out
AS-18 Front (Drum 1) Pawl In
AS-19 Rear (Drum 2) Pawl Out
AS-20 Rear (Drum 2) Pawl In
AIR
COMPRESSOR
MOISTURE
EJECTOR
8M
ALCOHOL
INJECTOR
SHUT-OFF
VALVE
AIR
FILTER
UNLOADER
VALVE
120 PSI
(8.3 bar)
SAFETY
VALVE
165 PSI
(11,4 bar)
OPTIONAL
AIR DRYER
AIR RESERVOIR
RF-06
0
37.4 CFM
ENGINE
AIR
CLEANER
TO AIR SYSTEM
COMPONENTS
FIGURE 1-14
Current air system shown, past systems are similar.
DRAIN
VALVE

Manitowoc 2250 Specifications

General

Brand	Manitowoc
Model	2250
Category	Construction Equipment
Language	English