Manitowoc MLC300 Guide

Manitowoc F2280-35
Published 07-21-21
MLC300 Lubrication Guide
Automatic Lubrication System Troubleshooting
Symptom Probable Cause Solution
1. Pump will not operate. Not receiving 24-volt DC
input.
Blocked pump cam.
Check fuses and electrical supply.
Check electrical supply to the pump, by tracing to electrical
source. Repair.
If voltage is available to pump, check for blockage. Repair.
Replace pump motor if blockage is not identified.
2. The pump motor is running
but there is no grease being
discharged.
Air pocket at pump element
inlet.
Disconnect main delivery hose from pump outlet.
Run pump until solid grease with no bubbles flows from
outlet. If solid grease does not discharge after 20 minutes,
pump inlet is blocked.
NOTE Depending on operating temperature and grease
type, it can take up to 10 minutes to obtain full
volume at outlet.
Blocked pump inlet. Remove pump element from pump body and check suction
inlet port for foreign particles.
Reassemble pump and element, then test pump. If pump
element does not discharge grease, replace element.
3. Pump operated with an
empty reservoir.
Grease in reservoir is low. Fill reservoir and test system with grease gun at system
manual grease fitting.
Disconnect main delivery hose from pump and watch until
solid grease with no bubbles flows from outlet.
Reconnect main delivery hose to pump outlet.
4. Grease is discharged at
pressure relief valve.
There is blockage in meter
valves, hose, tubing, or at
bearing.
Test system with grease gun at system manual grease fitting.
Loosen each outlet line at primary valve, one at a time. The
blocked outlet line will start flowing grease and indicator pin
starts indexing.
Retighten all outlets at primary valve.
Trace hose that flowed to its secondary valve.
Repeat process of loosening each outlet one at a time until
blocked line is found.
Retighten all outlets.
Repair bearing blockage.
If a metering valve is causing blockage, replace valve.
5. Indicator pin on primary
valve does not move.
See item 4. See item 4.
6. Lubrication point is not
receiving grease.
Cut in hose or tubing. Replace hose or tubing.
FOR REFERENCE
ONLY

Manitowoc MLC300 Specifications

General

Brand	Manitowoc
Model	MLC300
Category	Construction Equipment
Language	English