Loader on a 784 international is not getting full pressure when there is a load on the rear arms. Works fine when I place a bar on the hitch to support the arms. Also works when there is no load on the arms in the raised position. The rear weight is not attached to the top link. There is external light rams fitted with the ih connection to the release valve location. The rear linkage supports a load when the engine is stopped for a considerable time eg overnight. Any ideas