The Principle Of Hydraulic Pump - Presto Lifts HPT 50 Series Operating Instructions Manual

The principle of hydraulic pump

(See figure 1-1)
Lifting
1. Put finger tip (1-6) on Lifting Position; Lift handle,
hydraulic oil flow from oil tank through channel A; Ball
A open; Oil flow to piston through channel B.
2. Press handle; Ball A closed, Ball B open; Oil flow
to sylinder from piston through channel B and channel
C; Cylinder lifted; Truck lifted.
Lower
1. Put finger tip (1-6) to Lowered Position
2. Part 1-39 move at D1 direction; Ball A and ball B
open; Oil flow to oil tank from cylinder through chan-
nel C, ball B, and channel A.
Transport
1. Put finger tip (1-6) to Neutral Position; Part 1-39
move at D1 direction; Ball A open.
2. Lift handle; Oil flow to piston from oil tank through
channel A.
3. Press handle; Oil flow to oil tank from piston
through channel B, ball A and channel A.
Figure 1-1. Cut-away pump diagram
Page 15
PRESTO OWNER'S MANUAL: HPT 50 & 55 SERIES —