Dawson EMV-70 METRIC, Operator'S Instructions/Spare Parts List

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7.0 TROUBLE SHOOTING
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.
7.1 EMV clamp does not close
7.1.1 Check that base machine hydraulics lines are correctly connected – see
section 4.2. Operate control lever in both directions to check flow
directions.
7.1.2 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.
7.1.3 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.
7.1.4 Remove the cylinder and inspect for mechanical damage inside the clamp or
inside the cylinder.
Pilot
Operated
Check Valve