Sounds like an unfortunate situation, sorry to hear.

Hydraulics in general operate with one basic principal: Apply pressure to one side of a piston while venting the opposite side to a resevoir. The fluid needs to be directed and redirected as desgined to operate correctly.

In my oppinion I do not see how reversing the lines could have any impact on any other device in the system. The only thing that would occur is the cylinder that the lines were crossed on would work in reverse. It may be possible for a damaged check valve to create other problems, cylinder failure may be one those problems.

It may be helpful to review your owners manual. I believe you will find some important facts regarding "Pump" operations under certain conditions. Unpleasant and unwanted things can/will occur "IF and/or WHEN" certain procedures are not followed.