Hog Technologies SK5500, Operation Manual, Page: 108 / 161

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Section 5 - Scheduled Maintenance
5.8 Checking UHP Pump Oil Level
& Changing Crankcase Oil
Checking Oil Level
Jetstream UHP pumps have specific procedures
for checking the crankcase oil while the pump is
operating and when it is shutdown. Following the
correct procedure is critical to maintaining the
correct oil level and to prevent the possibility of
overfilling 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 filled 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.
Crankcase Oil Level - Pump Running Crankcase Oil Level - Pump Shutdown 5 To 8 Hours
The upper sump holds a large volume of oil that
drains very slowly back into the main sump. Con-
sequently, there is a significant difference in the
oil level while the pump is operating and when it
is shutdown. It takes 5 to 8 hours for oil in the
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.