Lake Monitors Hydraulic System Test Analyzers (Style K & T) - Manual (Page 3)

Generally, it is recommended that the reverse flow capable variation
of analyzers is used to diagnose cylinder leakage as this will make
the tests simpler and compliment the bi-directional nature of the flows
to and from the cylinder. This being stated, the standard analyzer
product is not capable of reverse flow and the misuse of the product
will result in damage to the analyzer and/or the system under test
that is not covered by the warranty.
Run the piston to one end of its stroke and leave it stalled in this posi-
tion and power down the system. Plumb the analyzer into the line at
the end of the cylinder in which the piston is resting, orient the flow
arrow toward the directional valve. (See Illustration 3)
Fully close the Analyzer's load valve by turning it completely CW
(clockwise). Power up the system and actuate the directional valve so
that the piston remains stalled under pressure. Do not actuate in the
reverse direction unless your analyzer part number includes an
–RF at the end (reverse flow capable). Now check the pressure
gauge on the Analyzer. If pressure exists open the valve for a
moment and close it again. If pressure returns, the cylinder is leaking.
After checking, power down the system remove the analyzer and
restore the plumbing connections, run the piston to the opposite end
of the cylinder and repeat the test. This test does not check the cylin-
der bore for inclusions. If the bore is suspect the cylinder should be
removed from the system disassembled and inspected.
Illustration 3
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Introduction
A properly designed and maintained hydraulic system will perform
dependably under extreme conditions, but as its components begin to
wear overall efficiency of the system will suffer. This loss of efficiency
in various components can place a strain on the entire system result-
ing in higher oil temperatures which tend to jeopardize the lubricating
properties of oils. The other issue that results from improperly operat-
ing hydraulic systems with excessive wear and/or contamination is
the increased energy consumption that can be expected.
The Troubleshooting Problem
Because a loss of efficiency can be attributed to a variety of individual
component failures, a systematic approach to troubleshooting will
more positively locate the source of the failure. Simply replacing sys-
tem components on a trial and error basis will waste time and money.
Generally, the ideal method for diagnosing and servicing hydraulic
systems involves testing the most costly components first while
repairing or replacing the least costly components as a result of the
outcome of these tests.
The Troubleshooting Solution
To assure the proper operating characteristics of hydraulic system
components, Lake Monitors offers its proven products and a 5-Step
Method to systematically perform hydraulic troubleshooting.
Warning! The Analyzer and troubleshooting method are designed to be general in
nature and require a knowledgeable user to identify system components and have an
understanding of system operating characteristics. Use by non-qualified personnel can
lead to serious system damage and/or personal injury.
The heart of Lake’s troubleshooting
method is the Hydraulic System Analyzer.
(See Illustration 1) The Analyzer pro-
vides direct indication of flow rate, sys-
tem pressure and temperature*. It also
has an integral load valve that is adjust-
ed during the troubleshooting process.
* The T-series of products offers temperature, flow and pressure indication,
whereas the K-series offers flow and pressure.
Illustration 1
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