
Reference
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INTRODUCTION
18000 SERIVCE/MAINTENANCE MANUAL
1-20
Published 12-05-17, Control # 035-23
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. Each hydraulic system
operation is explained in different sections of this manual.
Hydraulic Tank
Hydraulic tank has a breather, suction filter, return filter, sight
gauge, temperature gauge, temperature sensor, and level
sensor. Hydraulic tank has two sections: a suction section
and a return section.
The suction section has two mesh strainers that allow fluid
bypass around strainer at 3 psi (0,21 bar) if they become
plugged. The breather protects the tank from excessive
pressures (opens at 3 psi [0,21bar]) or vacuum (opens at 1.5
in HG [38 mm HG]).
The return section has three (current production), two (past
production) media filters that allow fluid bypass around filter
at 25 psi (1,7 bar) if they become plugged. A diffuser inside
tank return line reduces turbulence created by fluid returning
to tank.
Digital display indicates when hydraulic tank fluid level is low,
hydraulic fluid temperature is too high, or filter blockage.
Tank hydraulic strainers and filters remove contaminants
from fluid. System 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.
NOTE:
See Lubrication Guide in Section 9 of this manual,
for recommended replacement of hydraulic fluid.
Shutoff Valves
Two manual shutoff valves are located between the hydraulic
tank and suction manifold. Close shutoff valves when
performing maintenance on hydraulic systems. Open shutoff
valves before starting engine.
Charge Filters (Past Production)
Accessory pumps supply hydraulic fluid through charge
filters to high pressure accessory manifold. Charge filter
elements must be replaced when system fault alerts are
enabled and digital display indicates that charge filters need
to be serviced.
Suction Manifolds
Suction manifolds supply hydraulic fluid to all system pumps.
Each hydraulic system draws hydraulic fluid from a suction
manifold as needed.
Return Manifolds
Return fluid from closed-loop relief valves, brake valves,
motor servos, cylinders, pump case drain, and motor case
drain is routed to main return manifold or cooler return
manifolds before returning to hydraulic tank. The final cooler
return manifold has a 20 psi (1,4 bar) bypass that allows fluid
to bypass cooler if it becomes plugged.
Hydraulic Fluid Cooler
If hydraulic fluid temperature is above 140°F (60°C), a valve
opens to cooler to allow return hydraulic fluid through cooler
before returning to tank. If hydraulic fluid temperature is
below 140°F (60°C), cooler valve closes to allow return
hydraulic fluid flow directly to tank.
Supercharge Pumps (Past Production)
See Sauer-Sundstrand Series 90 Service Manual for a
description of a hydraulic piston pump.
The supercharge pump is a fixed displacement gear pump
that draws hydraulic fluid from tank suction manifold and
supplies make-up hydraulic fluid to supercharge manifold.
The supercharge accessory pump is a fixed displacement
gear pump that draws hydraulic fluid from tank suction
manifold and supplies hydraulic fluid to accessory system
and high pressure accessory system.
Accessory Pumps (Current Production)
The two accessory pumps are fixed displacement gear
pumps that draw hydraulic fluid from tank suction manifold
and supply high pressure hydraulic fluid to the high pressure
accessory manifold. One pump is mounted on the left
forward side engine and one is mounted on the right forward
side pump drive.
Hydraulic Pumps
See Sauer-Sundstrand Series 90 Service Manual for a
description of a hydraulic piston pump.
All main pumps are variable displacement, axial piston
pumps that operate in a bi-directional closed-loop system.
Main host 1 (Drum 1), main host 2 (Drum 2), boom hoist
(Drum 4), and swing systems have two hydraulic pumps.
Travel system has a separate pump for each crawler.
Each pump contains:
•
Charge pump
•
EDC (Electrical Displacement Control)
•
Cylinder block where pistons are positioned axially
around a drive shaft
•
Charge pressure relief valve
•
Two multifunction (relief) valves
Содержание 18000
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Страница 4: ...R e f e r e n c e O n l y THE ORIGINAL LANGUAGE OF THIS PUBLICATION IS ENGLISH ...
Страница 210: ...R e f e r e n c e O n l y NOTES SKETCHES AND PHOTOGRAPHS ...
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