Manitowoc 16000 User Manual

Reference Only
INTRODUCTION 16000 SERVICE/MAINTENANCE MANUAL
1-14
Published 05-03-17, Control # 228-03
Hydraulic Components
High-pressure piston pumps driven by a multi-pump drive
transmission provide independent closed-loop hydraulic
power for crane functions. Each system has relief valves to
protect for overload or shock.
Hydraulic Tank
The hydraulic tank has two sections separated by a baffle: a
suction section and a return section. Components include a
separate breather, suction strainer, return filters, diffuser,
temperature sensor, level sensor, and pressure ports.
The suction section has a 150-micron (100-mesh) strainer
that allows fluid bypass around the strainer at 0.2 bar (3 psi)
if it becomes plugged. The breather protects the tank from
excessive pressures or vacuum opening at 38 mm (1.5 in) of
mercury (Hg).
A system fault alarm indicates when the hydraulic tank fluid
level is low, hydraulic fluid temperature is too high, or filter is
blocked.
Strainers and filters remove contaminants, but this filtration
does not transform deteriorated fluid into purified-quality
fluid. A program to test or replace hydraulic fluid at
scheduled times must be established for efficient operation
of all hydraulic systems.
Shut-off Valve
A shut-off valve is located between the hydraulic tank and
the suction manifold. Close this valve when performing
maintenance on hydraulic systems. Before starting the
engine, always check that the hydraulic tank shut-off
valve is open.
Return Manifolds
Return fluid from the motor and pump case drains is routed
through the main return manifold and cooler before entering
the hydraulic tank. The main return manifold has a relief
check valve set at 1.7 bar (25 psi); allowing fluid to bypass
the cooler if it becomes plugged. Return fluid from relief
valves, brake valves, drum pawls, and counterbalance pin
cylinders returns to the other return manifold, bypassing the
cooler before entering the tank.
Oil Temperature Valve
At the hydraulic tank, a thermostatically controlled valve is
located on the return-to-cooler manifold. At 60°C (140°F),
the valve begins to open, allowing return oil to flow to the
cooler.
Accessory/MAX-ER Pump
The accessory/MAX-ER pump is a variable displacement
piston pump that draws hydraulic fluid from the suction
manifold and supplies hydraulic fluid to high and low
pressure accessories and the optional MAX-ER attachment.
Hydraulic Pumps
See the hydraulic pump manufacturer’s service manual for a
description of a hydraulic piston pump.
The drum, swing, and travel pumps are variable
displacement, axial piston pumps that operate in a bi-
directional closed-loop system
. Each pump contains the
following components:
- A charge pump
- EDC (Electrical Displacement Control)
- A cylinder block where pistons are positioned axially
around a drive shaft
- A charge pressure relief valve
- Two multifunction (relief) valves
A system charge pump draws fluid directly from the tank
suction manifold and delivers it to the closed-loop system at
a charge pressure of approximately at 24 bar (350 psi). The
charge pressure depends on the engine load/speed,
pressure relief valve settings, and hydraulic system
efficiency.
When a system control handle is moved, a node controller
sends a variable 0 to 24 volt output to the pump EDC as
required for handle command direction. The pump EDC tilts
the swashplate to the stroke pump in the command direction.
Pump pistons move within the cylinder block as the block
rotates. The longer stroke of each piston draws in return fluid
from the system motor. As the stroke shortens, hydraulic
fluid is pushed out of the pump piston cylinders into the
hydraulic piping to the motor. Pressurized hydraulic fluid
from the pump turns the motor in the command direction.
Hydraulic fluid displaced by the motor returns through the
hydraulic piping to the inlet side of the system pump.
The swashplate tilt angle determines the volume of fluid that
can be pumped to the motor. Increasing the swashplate tilt
angle increases the piston stroke length, allowing more fluid
to be pumped to the motor. Motor servos in the drum and
travel systems allow low and high-speed operation.
Each pump has two multifunction valves that consist of a
system relief valve and charge flow make-up check valve.
Pump system multifunction valves control the maximum
system pressure and protect each pump system from
damage by limiting pressure spikes in each operating
direction. When the preset loop system pressure is reached,
multifunction valves limit system pressure by de-stroking the
pump or transferring fluid from the high-pressure side to the
low-pressure side.
Charge Pressure
The charge pressure in each closed-loop system is preset at
approximately 24 bar (350 psi) with a relief valve in the
charge pump. The charge pressure must be at the preset
value as lower pressures can cause a slowing or stopping of

Manitowoc 16000 Specifications

General

Brand	Manitowoc
Model	16000
Category	Construction Equipment
Language	English