Troubleshooting
Problem Cause Solution
Pump operates continuously. Pump has lost prime. Examine lubricant supply. Refill reservoir
if necessary.
Air pocket trapped in lubricant. Loosen vent plug one turn. Allow pump to
operate until trapped air is pumped out.
Close vent plug.
Pump continues to operate without discharging
lubricant.
Pump check () and steel ball ()
fouled.
Remove and clean checks and check seats.
Vent valve () fouled. Replace vent valve.
Foreign material prevents needle ()
from seating properly.
Clean or replace parts.
Pump fails to operate. Air system is leaking. Verify air supply is connected.
Verify air system is not leaking.
Injectors fail to cycle. Leak in supply line. Examine lines and connections.
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