Frame Driven Lube Oil Pumps
The lube oil pump is driven by
the chain drive system at the auxiliary end of the frame. The lube oil
pump sprocket and the crankshaft sprocket are sized so that the pump is
running at the correct speed when the frame is running at rated speed.
Oil pump discharge pressure is
held nearly constant by a spring loaded regulating valve within the pump
head. Lube system pressure can be raised or lowered by adjusting this
valve. Normal pressure on the discharge side of the lube oil filter is
set at the factory at 60 PSI when the crankshaft speed is greater than
half rated speed. If oil pressure drops below 50 PSI, the reason should
be found.
The larger frames, JGU:Z and KBB:V,
utilize an external pressure relief valve located downstream of the lube
oil filter. The
external pressure relief valve is used to set the system pressure. The
regulating valve located on the main lube oil pump is to be set fully
closed.
If the crankshaft speed is less
than 50%, there will not be enough flow through the pump to maintain proper
lube oil pressure to the frame - an auxiliary lube oil pump will be needed.
Ariel
Corporation Application Manual
23 February 2007