Examine the fittings [1,2] on top of the oil pump tank. The oil collects on top of the oil pump tank  either behind or in front of the sight glass bracket, underneath the leaking fitting. Fully seat the hose(s) into the fitting(s). Check the end of the hoses to make sure they are cleanly cut. Tighten or replace any leaking fittings.
Note: Do not disconnect the oil filled hoses unless there are still leaks after reseating the hoses into the fittings as this can introduce air in hoses which will need to be purged before checking for correct pump operation.