bump-down

bump-down

[′bəmp‚dau̇n]
(petroleum engineering)
In an oil well pumping operation, the pump's hitting the bottom in the downstroke because the rod between the pumping jack and the pump seat is too long.
References in periodicals archive ?
The hydrostatic drive is controlled by a single lever with electronic straight tracking, two bump-up, bump-down speed buttons with six speed increments, and an adjustable ratio of reverse to forward speed.