TA3H, TA3SH & TA3.5SH
Page 4 - 5
4. Description
4.6
Hydraulic System
The hydraulic system Figures 4.4 & 4.5 provides power to move the machine, through the
hydrostatic drive, operate the vehicle steering and to power the skip elevation. It also provides
power for skip rotation on swing skip models.
An engine driven hydraulic pump powers the hydraulic motor mounted on the transfer box which
transmits power to both axles. A second engine driven hydraulic pump provides power for
steering and skip operation. The pumps draw oil from a tank located inside the chassis. The tank
is fitted with a suction strainer, an oil level gauge, and a filler/breather cap.
The pump providing power for steering and skip operations generates a maximum pressure of
170bar (2500 psi) for forward tip machines and 210 bar (3045 psi) swing skip machines. The
system is protected by a relief valve in the control valve that is set at the same pressure.
A return line filter is fitted to the circuit and is of the replaceable cartridge type.
An oil cooler is fitted to cool the hydraulic oil.
Steering of the dumper is by means of a single hydraulic ram connecting the front and rear
frames, the oil supply to the ram is controlled by an “Orbitrol” hydrostatic steering unit.
The unit receives oil via a carry over port in the 3 way control valve and constantly meters oil to
the steering ram as the steering wheel is turned.
The control valve, operated by a lever next to the drivers seat, controls the lifting, lowering and
(on swing skip models) slewing of the dumper skip.
The skip can be elevated at varying speeds dependent on engine speed, and it can be stopped
at any intermediate point for discharging of partial loads.
Summary of Contents for TA3.5SH
Page 6: ...Table of Contents 4 TA3H TA3SH TA3 5SH Table of Contents...
Page 72: ...Page 7 10 TA3H TA3SH TA3 5SH 7 Standard Operating Procedures...
Page 76: ...Page 8 4 TA3H TA3SH TA3 5SH 8 Emergency Operating Procedures...
Page 114: ...Page 11 2 TA3H TA3SH TA3 5SH 11 Recovery...
Page 118: ...Page 13 2 TA3H TA3SH TA3 5SH 13 Glossary...
Page 119: ...TA3H TA3SH TA3 5SH Appendices 1 Appendices Appendix 1 Electrical Diagrams...
Page 126: ...Appendices 8 TA3H TA3SH TA3 5SH Appendices...
Page 127: ...TA3H TA3SH TA3 5SH Appendices 9 Appendices Appendix 2 Hydraulic Diagrams...
Page 132: ...Appendices 14 TA3H TA3SH TA3 5SH Appendices...
Page 134: ...Warranty 2 Warranty Certificate...
Page 135: ......