Ditch Witch J20 Repair Manual -

Ignoring the 200-hour hydro filter change is the number one cause of J20 transmission failure. The manual explicitly states that a clogged filter starves the pump of oil, leading to a $2,000 rebuild.

: Older models with Wisconsin engines may have "weak" starters; it was common practice to use a priming valve to squirt a shot of gas directly into the intake for the first start of the day. ditch witch j20 repair manual