LOAD TESTING PROCEDURE - CONTINUED
BOOM CYLINDER DRIFT TEST - CONTINUED
Record readings every 5 minutes for 20 minutes.
Maximum drift allowed in 20 minutes is 2 in. (5.1 cm).
If drift exceeds 2 in. (5.1 cm) in 20 minutes, check float and emergency lower valves for
tightness. With boom fully lowered, open float valves and ball valves and try to lift boom;
this will flush valves. Close valves and repeat same flushing procedure with emergency
lowering valves. Again, make sure valves are tightly closed. An uneven voltage reading
for pressure sensors (one side increases and other side decreases) will indicate which lift
cylinder or blocking valve to investigate.
Repeat drift test.