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Scheduled Maintenance
5.5 Checking UHP Pump Oil Level
& Changing Crankcase Oil
Checking Oil Level
Jetstream ultra high pressure pumps have specic
procedures for checking the crankcase oil while
the pump is operating and when it is shutdown.
Following the correct procedure is critical to main-
taining the correct oil level and to prevent the
possibility of overlling the crankcase, which will
damage the pump.
The pump power end uses a splash/gravity oil
circulation system for internal lubrication and oil
distribution. The crankcase has an upper sump
that is lled by the splashing action of the crank-
shaft as it rotates. Oil slowly drains from the
upper sump through small holes which provide
lubrication to certain components that would not
be properly lubricated otherwise.
The upper sump holds a large volume of oil that
drains very slowly back into the main sump. Con-
sequently, there is a signicant dierence in the
oil level while the pump is operating and when it
is shutdown. It takes 5 to 8 hours for oil in the
Crankcase Oil Level - Pump Running Crankcase Oil Level - Pump Shutdown 5 To 8 Hours
upper sump to completely drain to the main sump
after the pump is shutdown. As a result, the pump
must sit overnight before an accurate crankcase
oil level is indicated in the sight glass when the
pump is not operating.
Because of the crankcase design, the most accu-
rate way to check the oil level during operation is
while the pump is running. The following section
outlines the procedures for checking the crankcase
oil level with the pump running or when the pump
is shutdown. Always make sure the truck is parked
on level ground with the wheels blocked before
checking the crankcase oil level.
Crankcase Oil Level - Pump Operating:
1. Make sure the crankcase oil level is at the full
mark, then turn the 40K Clutch ON to activate
the high pressure pump.
2. Operate the pump for 20 to 30 minutes to al-
low the upper sump to ll and the oil level in
the main sump to stabilize.
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