AMT 4946-99, Specifications Information And Repair Parts Manual

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4946-250-00 3 3/2015
Specifications Information and Repair Parts Manual
4942-99 & 4946-99
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Troubleshooting Chart
Symptom Possible Cause(s) Corrective Action
Pump does not prime 1. Suction line above liquid 1. Ensure that open end of suction line remains
completely below surface of liquid
NOTE: For stubborn liquids, try filling
pump through discharge port before
operation. A filled casing primes
quickly.
2. Pump speed too slow 2. Operate pump handle rapidly until pump primes
(up to 30 cycles)
3. Unsuitable suction line 3. Pumps are intended for use with suction line
supplied. Longer or collapsible suction line may
prohibit priming. Use short length rigid line similar in
diameter to suction port. (Maximum pump height
above liquid 36”)
4. Clogged suction line and/or filter 4. Clean suction line and/or filter (where applicable)
5. Suction line air leakage 5. Verify that all suction line connections are sealed
tightly. Use Teflon® tape or appropriate sealant if
necessary
6. Cover air leakage 6. Inspect pump cover(s) for looseness and
damaged or slipped gaskets. Replace damaged
gaskets and snug-up cover(s)
7. Shaft air leakage 7. Verify shaft seal is properly seated and in good
condition. Replace seal if worn or damaged
8. Housing air leakage 8. Inspect entire pump housing, cover(s), and shaft
for cracks. Replace damaged parts
9. Shifted or worn rotor 9. Loosen all cover bolts. View pump from side with
suction/discharge ports in vertical position and on
right hand side. Reposition rotor by grasping covers
and sliding towards 3 o’clock position. Do not use
excessive force. Hold in position and re-tighten
cover bolts
10. Damaged/worn pump parts 10. Remove pump cover and inspect for broken
pieces. Components should have smooth finish, no
large grooves or voids. Replace damaged parts.
Piston type pumps may include a poppet valve
which is designed to prevent back-flow. If excessive
leakage past valve is found, replace valve (some
leakage is normal)
Handle difficult or impossible to move 1. Pump has not been used for some time 1. Remove pump cover and inspect for crystallized,
solidified, or gummy remains. Clean parts. To
prevent future occurrences, flush pump with
appropriate solvent after pumping problem liquid
2. Damaged/worn pump parts 2. Remove pump cover and inspect internal parts.
Components should have smooth finish, no large
grooves or voids. Replace damaged parts
3. Corroded pump parts 3. Remove pump cover and inspect for corrosion.
Clean parts and use pump only for liquids which are
compatible with pump component materials
4. Damaged/worn gear drive parts 4. a) Remove oil plug from gear case and verify oil
level is correct, top-up if necessary. See
“Maintenance” for proper lubricant
b) If pump is still difficult to turn, drain gear oil and
inspect oil for contaminants indicating damaged
gears. Replace damaged parts
Insufficient flow 1. Clogged, collapsed, or undersized filter, suction
and/or discharge line 1. Pumps are intended for use with supplied rigid
line and filter (where applicable). Verify line and filter
are clean, not pinched closed, and of similar size of
port connection
2. Also see above “Pump does not prime”
2. Check and repair as necessary