10
climates, the oil must not have a rating higher than
4600 SUS. Conditions that allow the fluid to drop in
temperature causing the viscosity to be higher than
930 SUS will require warm up procedures before
using the system. If there is some uncertainty about
the oil that you are using, consult with the
manufacturer or distributor of the oil.
Every oil mfg. offer oils that meet the needs of
hydraulic systems. An example of good oil is
Mobile
DTE-25
or equivalent.
HYDRAULIC PUMP MOUNTING
CAUTION!
FRETTING OCCURS WHEN A MALE SPLINE
SHAFT IS INSTALLED INTO A FEMALE SPLINE
AND THE TEETH BECOME WORN OVER TIME.
BEFORE INSTALLING THE PUMP INTO THE PTO,
GREASE THE SPLINES WITH AN APPROVED
SPLINE LUBRICANT.
FRETTING
During installation, ensure grease is applied to all the
teeth and teeth roots of both the PTO and pump. Fill
the valleys of the spline roots of both PTO and pump
shaft. This allows extra lubricant to carry through the
spline contact area by centrifugal force. While it can
significantly prolong spline life, this procedure
cannot guarantee to completely eliminate excessive
wear. Chelsea supplies a packet of this grease with
every PTO they sell and it is also available in a
grease gun tube. For more information, see the
Accessories page in the Appendix.
Maintaining this area requires removing the pump
from the PTO, cleaning the splines of the old grease,
drying the cleaner, reapplying new lube and re-
installing the pump. This is not easy to do and is very
time intensive. Some Chelsea PTOs, such as the
constant mesh series, have the option to install grease
fitting which allows grease to be pumped into this
area without removing the pump. Consult your PTO
manufacturer for availability. We strongly suggest
this option for constantly engaged PTOs since it
greatly reduces maintenance time.
MAINTENANCE CONSIDERATIONS
Even the best lubricant is eventually pushed out of
the connection area by centrifugal force, temperature,
and vibration. The time frame for maintenance
depends on many operational and environmental
factors, so a fixed time schedule is not practical.
When the lubricating film is lost it must be
replenished. Consult your PTO manufacturer for
more information.
Shaft fretting is not a failure of the generator, pump
or PTO. Fretting conditions are a result of torsion
vibration generated by the engine. This vibration is
transmitted through the transmission and PTO. Since
the pump is the last member in the chain, the spline
areas of the PTO and pump suffer the effect. This
condition occurs primarily at low engine idle speeds.
To avoid this condition and prolong shaft life, keep it
well lubricated. Since this condition occurs at engine
idle, you may consider using a hot shift PTO instead
of a constant PTO. With a constant PTO, the pump is
always on when the engine is on. This subjects the
pump and other components to unnecessary wear.
Also, consider operating the generator at a high
engine idle.
We understand that every application is different and
is driven by your needs. If you require generator
power at low engine idle and operation with a
constant PTO, our generator will provide many years
of reliable power if the maintenance requirements are
met.