Low Capacity |
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Possible Causes |
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What To Do |
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Pump speed too slow |
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Check engine speed and PTO on pulley ratio. Consult pump performance curve. Use tachometer on pump if speeed is questionable. |
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High differential pressure |
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Restriction in discharge piping or hose to small. Vapor equalization lines too small or not used. |
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External bypass valve stuck open or set too low |
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Readjust, repair, or replace valve. |
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Clogged strainer |
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Clean strainer. |
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Suction pipe too small or restricted |
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Indicated by pump inlet pressure dropping several pounds when pump is started. Remove restriction or modify piping. |
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Worn vanes |
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Replace. |
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Pump without vapor return |
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Without vapor equalization, a pump can remove only about 3% of the truck tank capacity per minute without severe cavitation and capacity loss. |
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Worn sideplates |
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Reverse or replace sideplates. Check universal drive assembl to make sure angularity is within limits, yokes are
parallel and slip-joint is greased. Check bearings. Check pulley alignment on belt drive pumps. |
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Vanes sticking |
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Remove vanes and clean out foreign matter (check strainer). Replace vanes if swollen. |
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Products | LCG PT-Series Pumps
