Manitowoc 2250 Service And Maintenance Manual

Reference Only
Manitowoc Published 11-06-15, Control # 040-13 1-25
2250 SERVICE/MAINTENANCE MANUAL INTRODUCTION
1
Hydraulic Components
See Hydraulic Schematic Drawing at the end of this section.
High-pressure piston pumps driven by a multi-pump drive
provides independent closed-loop hydraulic power for crane
functions. Each system is equipped with relief valves to
protect for overload or shock. Each hydraulic system
operation is explained in different sections of this manual.
Each hydraulic solenoid valve in this section is assigned an
HS number. The HS number identifies each hydraulic
solenoid valve.
Hydraulic Tank
Hydraulic tank has a vented fill cap, high and low level sight
gauges, vacuum sensor, temperature sensor, and fluid level
sensor. Digital display indicates temperature and pressure
(vacuum) of fluid in the reservoir. Hydraulic fluid vacuum is
displayed as a pressure between 7 and 18 psi (0.5 and 1.2
bar absolute) depending on engine speed, ambient
temperature, and filter condition. The breather protects the
tank from excessive pressures by opening at 3 psi (0,21 bar)
or vacuum opens at 1.5 in HG (38 mm HG).
Hydraulic tank has two sections: a suction section and a
return section. The suction section has a 100 micron mesh
strainer that allow fluid bypass around strainer at 3 psi (0,21
bar) if plugged. Two spin-on filters also filter hydraulic suction
fluid. Replace filter elements when a pressure of 7 (0,5
absolute) is shown on digital display.
Return section inlets are through check valves. A diffuser
inside tank return line reduces turbulence created by fluid
returning to tank.
NOTE: See Lubrication in Section 9 for recommended
replacement of hydraulic fluid.
Shutoff Valve
A manual shutoff valve is located between the hydraulic tank
and suction manifold. Close shutoff valve when performing
maintenance on hydraulic systems. Open shutoff valve
before starting the engine.
Suction Manifold
Suction manifold supplies fluid to all system pumps. A line
between suction side of tank and suction manifold has shut-
off valve. When shut-off valve is open, fluid flows from tank
through the valve to suction manifold. Suction manifold
distributes fluid through to charge pumps of the six main
system pumps and to the auxiliary pump and fan pump.
Return Manifolds
Return fluid from closed-loop relief valves, brake valves,
motor servos, cylinders, fan drive, pump case drain, and
motor case drain is routed to main return manifold or cooler
return manifolds before returning to hydraulic tank.
Hydraulic Fluid Cooler
To control hydraulic fluid temperature, return fluid from some
component systems return to tank through cooler. The cooler
has a 20 psi (1,4 bar) bypass valve that shifts to allow fluid to
flow around cooler if it becomes plugged.
Hydraulic Pumps
See Sauer-Sundstrand Series 90 Service Manual for a
description of a hydraulic piston pump.
Pump displacement depends on engine driven pump speed
through pump drive and swashplate tilt angle. The engine
provides power for work, while the swashplate tilt angle
provides speed control. Engine speed is set and controlled
with hand or foot engine throttle.
The auxiliary pump provides supply hydraulic fluid pressure
for accessory valve operation. The fan pump provides fluid
HS-1 Travel Brake
HS-2 Left Crawler Frame Pins Engage
HS-3 Left Crawler Frame Pins Disengage
HS-4 Gantry Cylinders Extend
HS-5 Gantry Cylinders Retract
HS-6 Boom Hoist (Drum 4) Brake
HS-7 Swing Brake
HS-8 Swing Lock Engaged (Past Production Only)
HS-9 Swing Lock Disengaged
HS-10 Boom Hinge Pins Engage
HS-11 Boom Hinge Pins Disengage
HS-12 Auxiliary System Disable Relief
HS-13 Right Crawler Frame Pins Engage
HS-14 Right Crawler Frame Pins Disengage
HS-15 Boom Butt Handling Cylinder Extend
HS-16 Boom Butt Handling Cylinder Retract
HS-17 Rigging Winch Haul-In
HS-18 Rigging Winch Pay-Out
HS-19 Luffing Jib Hoist Drum Brake
HS-20 Variable Output Control (Proportional)
HS-21 Front Adapter Frame Pins Engage
HS-22 Front Adapter Frame Pins Disengage
HS-23 Rear Adapter Frame Pins Engage
HS-24 Rear Adapter Frame Pins Disengage
HS-25 Left Front Jack Extend
HS-26 Left Front Jack Retract
HS-27 Right Front Jack Extend
HS-28 Right Front Jack Retract
HS-29 Left Rear Jack Extend
HS-30 Left Rear Jack Retract
HS-31 Right Rear Jack Extend
HS-32 Right Rear Jack Retract
HS-33 Hydraulic Quick Disconnect Engage
HS-34 Hydraulic Quick Disconnect Disengage
HS-35 Travel 2-Speed

Manitowoc 2250 Specifications

General

Brand	Manitowoc
Model	2250
Category	Construction Equipment
Language	English