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TM-5-5420-279-23 Dry Support Bridge (DSB) (NSN
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LAUNCHER HYDRAULIC SCHEMATIC DRAWINGS
TM 5-5420-279-23
CHAPTER 2
Section I. DSB HYDRAULIC TROUBLE SHOOTING
a. Trouble shooting flow charts are provided to guide the Unit Maintenance personnel through a
procedure for rectifying specific faults.
b. This section is to be used to recognize, diagnose and rectify faults that may occur with the
DSB Launcher.
c.
Overviews of the hydraulic and electrical systems are provided at Appendices E and G.
d. To give the Unit Maintenance personnel familiarity and quick reference Appendix D provides
a hydraulic and electrical assembly location lists and drawings and Appendix F contains details of
the hydraulic manifolds.
e. Operator mechanical trouble shooting is provided in Chapter 9 of the operator's manual
TM 5-5420-279-10.
LAUNCHER HYDRAULIC SYSTEM OVERVIEW
a. A hydraulic pump, driven by a Power Take Off (PTO) from by the engine transmission,
provides the hydraulic pressure necessary to operate the equipment services.
b. Hydraulic oil under pressure is delivered to the hydraulic circuits through manifold blocks
containing solenoid valves which are electrically activated by remote or direct controls.
c.
The major assemblies that make up the hydraulic circuits are:
(1)
PTO - A mechanical connection, to the engine transmission system and hydraulic
pump, drives the hydraulic pump.
(2)
Hydraulic Pump - A variable displacement swash plate pump draws hydraulic oil from
a reservoir and delivers hydraulic oil under pressure to the hydraulic circuits.
(3)
Cross Connection - Mounted on the left-hand side of the vehicle behind the cab.
Allows the connection of a donor vehicle to provide hydraulic power should the hydraulic
pump fail on the host vehicle.
(4)
Hydraulic Circuit Interface Manifold Assembly - Located on the right hand chassis
behind the vehicle cab. Houses the hydraulic filtration system and solenoid valves. The
Crane system, Relax Cylinder circuit and launcher circuits are fed through this manifold.
Hydraulic oil is also fed back to the hydraulic reservoir through Tank and Drain lines.
(5)
Tail Lift Manifold - Located on the right hand rear chassis. Tail Lift Cylinders are
activated electrically by remote control through solenoid valves. The solenoid valves allow
hydraulic oil under pressure to operate the Cylinders. A manual method of operating the Tail
Lift is provided should there be a loss of electrical power.
(6)
A-Frame Rotate Manifold - Located on the left-hand side of the Slide Frame. The A-
Frame Rotate Manifold houses solenoid valves, which when activated allow hydraulic oil
under pressure to operate the A-Frame Rotate Cylinders and the Tilt Roller Cylinders.

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