Hydraulic Sequence Of Operation - Challenge MS-5 Instructions And Parts Manual

HYDRAULIC SEQUENCE OF OPERATION

NOTE: PLEASE SEE SECTION ON THE ELECTRICAL SEQUENCE OF OPERATION FOR MORE
DETAILS
HYDRAULIC SEQUENCE OF OPERATION
A. Pump relay is energized providing power to the
hydraulic motor.
B. Energize the UP solenoid (the table is sent up).
C. De-energize the UP solenoid (the table is sent
down).
F.300-B/MS-5 DRILL/JULY 2000
HYDRAULIC SCHEMATIC REFERENCES
(Drawing H-378 & H-407)
Once the pump relay (RL1) is energized, the hydraulic
motor runs with the UP solenoid de-energized. This
allows oil to flow through the UP solenoid valve (Item
#6) and back to the tank. The table remains in the
down position.
When the UP solenoid is energized, oil stops flowing
through the UP solenoid valve (Item #6), and flows to
the table up (TU) port of the table speed adjustment
valve (Item #9) and to the table up (TU) port of the
cylinder. Oil exits the table speed adjustment valve
(Item #9) through the table speed (TS) port and then
returns to the tank. The amount of oil that flows through
the valve affects how much oil flows to the cylinder.
This determines the speed of the cylinder piston. As
the piston moves up, excess oil in the cylinder is forced
out the excess (EX) cylinder port and back to the tank.
When the UP solenoid is de-energized, oil from the
pump flows freely through the UP solenoid valve (Item
#6) and back to the tank. This allows oil to flow out of
the cylinder through the table up (TU) cylinder port,
through the UP solenoid valve (Item #6), and back to
the tank. Two springs force the piston down. The pump
relay (RL1) remains energized.
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