Dawson EMV 550, Owner'S Manual

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Please ensure that troubleshooting, inspection work and repairs are undertaken by suitably qualified
personnel. Training can be carried out by the manufacturer or by your local approved Dawson distributor.
The following guidelines are intended to assist with basic diagnostics and are not intended to be a definitive
list – it assumes the inspector has a basic understanding of servicing techniques associated with this type of
equipment. Work should not be undertaken by a novice without adequate supervision.
EMV CLAMP DOES NOT CLOSE
Check that base machine hydraulics lines are correctly connected. Operate control lever in both directions to
check flow directions.
Remove the check valve cartridge from the rear of the clamp cylinder and inspect for contamination or
damage. The poppet inside the cartridge should move freely. If in doubt replace and use new seals.
Independently check the operation of the clamp cylinder with it removed from the hydraulic circuit. This
should only be carried out by a competent person.
Remove the cylinder and inspect for mechanical damage inside the clamp or inside the cylinder.
troubleshooting
Pilot Operated
Check Valve
Pilot Operated
Check Valve
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