The aluminum brake/steering manifold for this series machine, suffers from cavitation damage of the manifold at the location of the priority/bypass valve (which allows pump flow to bypass to impliment circuit when steering is not used / brake accumulator is fully charged). The cavitation damage to the block causes oil to leak past this valve, resulting in inability for the brake accumulator charge, hard steering and overall heat problems. The entire block needs to be replaced, but should take care not to use aluminium as will simply fail again in future; typically around 10,000 hours operating time (aluminium is 10 times more prone to cavitation damage than steel).