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Problem
Hydraulic Pump not shutting
off on Closed Center System
Oil leaking at hose
connection
300 Series 09/10
© 2010 Alamo Group Inc.
OPERATION
Possible Cause
Using Open Center Valve
Open Center Conversion Plug
Pumping over Relief Valve
Connection not tight
Did not use sealant
Connection cracked from
over-tightening
Mismatched Connection threads
or types.
Operation Section 4-25
Remedy
Replace Valve or Conversion Plug
and Main Relief
Replace with Closed Center Plug
Replace with No Relief Plug
Tighten connection
Apply a good sealant to connection
Replace cracked connection
Use correct connectors
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