OPERATING CONTROLS AND PROCEDURES 2250 OPERATOR MANUAL
3-80
Published 06-24-16, Control # 241-01
PILE DRIVING SYSTEM CONTROLS
General
See Figure 3-64 for the location of the following components.
The following identifies the location and function of the
hydraulic components that Manitowoc Cranes has provided
for the customer-supplied pile driving system.
Components Function
Hydraulic Tank
The hydraulic tank is mounted on the right front corner of
rotating bed. It houses the hydraulic oil for the system. The
tank’s capacity is approximately 246 L (65 gal).
A hydraulic tank shut-off valve is located at the bottom rear of
the tank where the suction hose exits. The valve handle must
be opened (in line with hose) before operating the engine.
A sight gauge and level decal are provided on the outside of
the tank.
The tank contains a 100-mesh filter strainer that prevents
large pieces of foreign matter from entering the pump.
Hydraulic Pump
The hydraulic pump is mounted on and driven by the 2250
swing pump.
The pump is a gear type with a flow rating of 159 L/min
(42 gpm) at 3,000 rpm when the engine is operated at high
idle.
Hydraulic Filter
The hydraulic filter is mounted near the directional control
valve in the return oil line from the spotter.
The filter has a 10-micron, spin-on type of element with a
visual service indicator.
Directional Control Valve
The directional control valve is mounted on the front of the
rotating bed. The valve has the following four sections:
• Inlet Section
- The inlet section routes oil from the pump to the two
work sections (A and B) of the valve and routes
return oil flow from the work sections through the
filter back to the tank.
- The inlet section has a relief valve that limits system
pressure to 207 bar (3,000 psi).
• Two Work Sections (A and B)
- Two electrically controlled work sections are spring-
returned to neutral. The work sections direct oil flow
to the customer-supplied cylinders in response to
the controls in the operator’s cab.
- Work sections A and B have a 4-way, 3-position
spool for controlling a cylinder. When in neutral,
work section valves A and B lock the cylinders in
position and allow oil flow to the customer-supplied
spotter system control valve. When enabled, work
sections valves A or B direct oil flow to the
customer-supplied cylinders. Return oil from the
cylinders flows through the system filter and back to
the tank.
• End Cap
- The end cap routes return oil back to the inlet
section or to the spotter system.
Spotter System Dump Valve
The spotter switch is a two-position on/off switch, mounted
on the left wall of the cab. The spotter switch controls the
operation of the two-position dump valve. When the spotter
switch is on, the green spotter light comes on. The dump
valve closes to allow oil flow from the directional control
valve to the spotter system control valve. When the switch is
placed in the OFF position, the green spotter light goes off.
The dump valve opens to allow oil to flow through the system
filter and back to the tank.
NOTE: When one or both directional control valves are
operating, oil available to operate the spotter
system is greatly reduced.
Cylinder Operating Controls
The controls are three-position, handle-operated electrical
valves that provide variable control of the customer-supplied
cylinders.
Handle A controls forward and reverse operation of work
section A of the directional control valve. Handle B controls
forward and reverse operation of work section B of the
directional control valve. Exact operation of the controls
depends upon how the customer connects the hydraulic
hoses to the cylinders.
CAUTION
Pump Damage!
The hydraulic tank shut-off valve must be open when the
engine is operating to prevent spotter system pump
cavitation.
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