Theory Of Operation - Manitowoc Grove TMS700E Service And Maintenance Manual

TMS700E SERVICE MANUAL
booming up (cylinder rod extended), booming down (cylinder
rod retracted), or holding (cylinder rod stationary).

Theory of Operation

The directional control valve bank housing the lift control
valve is supplied by flow from the hydraulic pump.
When booming up, oil unseats the poppet (check) valve in
the holding valve, letting oil flow to the piston side of the
Grove
cylinder. Pressure is applied to the piston, forcing the rod to
extend, raising the boom.
When booming down, oil enters the retract port of the port
block and flows to the cylinder rod side. When pilot pressure
reaches a pre-determined value, the main poppet unseats
and oil flows from the piston side of the cylinder to the
reservoir.
All return flow from the control valve goes to the reservoir.
Published 01-29-2015, Control # 512-01
BOOM
4
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