My Hydrotek had a small unloader mounted on the top of the deck. It had become mis-adjusted and was letting some of the water bypass the spray arms. This caused a pressure loss in the arms and slowed them down. Might see if yours has this and re adjust the unloader.
Hydro tek Surface cleaner swival problem
in Tools, Equipment & Basic Maintenance
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My Hydrotek had a small unloader mounted on the top of the deck. It had become mis-adjusted and was letting some of the water bypass the spray arms. This caused a pressure loss in the arms and slowed them down. Might see if yours has this and re adjust the unloader.