Manitowoc 2250 Service And Maintenance Manual

Reference Only
Manitowoc Published 11-06-15, Control # 040-13 1-29
2250 SERVICE/MAINTENANCE MANUAL INTRODUCTION
1
Motor case fluid drainage lubricates the motor and provides
a re-circulation of hydraulic fluid to control heat in closed-
loop system.
Loop flushing (purge) system consists of control valve (17)
and relief valve (18). If system pressure is above 200 psi (14
bar), loop flushing removes 4 gallons per minute (15 l/m) of
hot fluid from system for added cooling. If system pressure is
under 200 psi (14 bar) loop flush is disabled.
Accessory Systems
See Figure 1-13 for the following procedure.
Auxiliary pump obtains fluid from hydraulic tank through
suction manifold. Auxiliary pump supplies fluid to all
hydraulic cylinder systems. Fluid flow is from accessory
pump through auxiliary system disable valve, upper
accessory valve, proportional flow control valve, and to lower
accessory valve.
When auxiliary system is disabled, auxiliary system disable
relief valve HS-12 is opened. Hydraulic fluid from auxiliary
pump then returns directly to tank. Auxiliary system relief
valve also protects auxiliary pump and down-stream
components from excessive wear that higher pressures can
cause and reduces power demand on engine.
When a component of auxiliary system is enabled, auxiliary
system disable relief valve HS-12 shifts to block flow to tank.
Accessory system pressure builds up to 3,500 psi (241 bar)
allowing fluid to the auxiliary systems through auxiliary
system relief valve.
The suction manifold supplies hydraulic fluid to fan pumps.
Fan pump supplies hydraulic fluid to drive two fan motors
and provides pilot pressure to upper accessory valve with
Caterpillar engine. Fan relief valves protect fan pump and
two fan motors from damage by limiting the fans system
pressure to 3,250 psi (224 bar) with Cummins engine or
2,000 (172 bar) with Caterpillar engine. System pressure
after the fans is limited by relief valve to 300 psi (21 bar) for
pilot pressure or fluid return to tank.
The upper accessory valve includes:
• Rotating bed jacking cylinders (four)
• Front and rear adapter frame pin cylinders (four)
• Gantry raising cylinders (two)
The lower accessory valve includes:
• Boom hinge pin cylinders (two)
• Boom butt handling cylinder
• Rigging winch drum motor
• Crawler frame pins (two)

Manitowoc 2250 Specifications

General

Brand	Manitowoc
Model	2250
Category	Construction Equipment
Language	English