24 ► MB556 User Manual
TROUBLESHOOTING
If adequate pump ow is available from the carrier
pump(s) but is not getting to the attachment, consult
your service representative and review the following:
1. Attachment valve(s) are not actuating. Review all
electrical connections that are part of the attachment
kit.
2. Ensure proper voltage to the valve(s).
3. Ensure the REG port of the valve is not blocked.
4. Check to make sure the carriers main relief is set
to the manufacturers recommendation and that this
value is equal or greater than the attachment circuit
relief.
5. If the valve will not turn o, check the drain (tank)
line of the valve to ensure that the pressure is 50
psi or less.
FLOW TEST PROCEDURES
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