The basic power source for the log splitter is the ____. The power
source turns energy from gasoline into _____ energy which is used to drive the
The engine drives the attached ____ ____. What does this device do?
What is the path of the hydraulic oil from the pump and back to the pump?
What is used to control the flow of hydraulic oil in the system?
What device converts the force of the hydraulic oil into linear
Hydraulic systems have a reservoir (a tank) which holds the hydraulic oil for
a time before it is used again. This allows the oil to cool and compensates
for the varying amount of oil required for each part of a cycle.
Scroll down to the illustration cross-sectional view of the splitter's
hydraulic system. Click on the "Push" and "Pull" button to operate the handle
of the control valve.
Note the high-pressure and low-pressure sides of the
circuit in each position.
Note how the spool valve changes the path for oil flow.
Note how pressure is exerted on each of the piston in the cylinder.
Scroll down below the cross-sectional view to a listing of typical
specifications for log splitters.
How is the power of the gasoline engine typically rated?
What two specifications are given for the hydraulic pump?
What two specifications are given for the hydraulic cylinder?
What is the rated splitting force of the machine?
How is the splitting force calculated?
The cylinder is a two-stage cylinder. During one stage, hydraulic fluid
forces the piston shaft to extend from the cylinder. During the second stage,
hydraulic fluid is used to retract the piston shaft back into the cylinder.
Why is more fluid needed to extend than to retract the piston?
What is the difference in the pressures and flow rates during the
extension and retraction stages of this machine?
Download and watch the following mpeg videos: (See Instructions)
Find the pair of hydraulic cylinders which are used to lift and lower the
arm at the "shoulder" of the excavator. Find the hydraulic cylinder which
operates at the "elbow." Find the hydraulic cylinder which rotates the
Hydraulic cylinders operate in a linear direction. Hydraulic motors
provide a rotational motion. How many hydraulic motors are on the excavator
and what is their purpose?
Make a table similar to the one below. Fill in information for each
machine as you study it.
Hydraulic Machine Parts and
Lifts & lowers arm
& retracts elbow
Opens & closes bucket
1 Cab turret
Rotate the machine on stationary
Drive the left and right tracks forward and backward
Go to The
Operator's Seat Note the joy sticks and pedals. The controls in the cab are electrical; two joy sticks which send
electrical signals and 4 pedals use either electrical or mechanical links to