When the Boom Control Valve can no longer be adjusted to stop “Boom Drift”, as
described in the Maintenance section, the seals need to be replaced or cleaned.
To remove the seals, raise and lower the boom until the Pressure Gauge reads “0”. Using a 1/8” hex wrench, slowly
loosen the Down Control Screw on the Boom Control Valve two full turns, then slowly loosen the Up Control Screw(1)
two full turns as shown in Figure V1. This will release all oil pressure in the system.