Manitowoc Engineering Co.
7. STOP ENGINE.
8. Remove the gauge and securely reinstall the 1/4 NPT
pipe plug.
9. Remove the pipe plug from the OUTLET port.
CLEANING RELIEF VALVE (see Figure 5)
1. STOP ENGINE.
2. Clean the exterior of the oil pump to prevent dirt from
entering the pump when the relief valve is removed.
3. Remove the capscrews and pull the relief valve away
from the oil pump. Be careful not to damage the gasket.
4. Unscrew the bonnet from the body. There will be a
small amount of spring force left when the bonnet is
completely unscrewed.
5. Remove the spring guide, the spring, and the poppet.
6. Soak all parts in diesel fuel and blow clean with com-
pressed air.
7. Carefully inspect each part, especially the oil pas-
sages in the body, to see that all dirt has been removed.
If the seat in the body and the shoulder on the poppet are
cracked or otherwise damaged, replace these parts.
8. Reassemble the relief valve. Securely tighten the
bonnet against the body.
9. Using a new gasket if necessary, assemble the relief
valve to the oil pump. Tighten the capscrews evenly.
IMPORTANT
Relief valve must point toward INLET
port of the oil pump.
10. Prime the pump ("2000 Hour Maintenance" step 10)
and start the engine to check the pump for proper
operation.
11. Check the relief pressure and adjust it if necessary.
TROUBLE PROBABLE CAUSE REMEDY
Intermittant or 1. Low oil level. Fill sump to proper level.
no oil flow 2. Belt loose or worn. Tighten or replace belt.
3. Pulley loose on pump shaft. Check that key is in pulley and tighten setscrew in
pulley hub.
4. Pump sucking air. Tighten loose connections. Check suction hose for
worn spots; replace suction hose if necessary.
5. Relief valve bypassing oil. Adjust, clean, or repair relief valve.
6. Filter or magnetic screen plugged. Clean filter and/or magnetic screen.
7. Pump frozen (cold weather). Heat pump to thaw (keep water drained from sump).
8. Pump worn or broken. Repair or replace pump.
Alarm sounds 1. Flow switch contacts stuck closed. Replace flow switch.
continuously 2. No oil flow. Check "no oil flow" cause above.
3. Check valve(if equipped)stuck closed. Repair or replace.
FOLIO 1027-5
395143
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