Harbor Freight Tools 62779 User Manual - Page 15

Troubleshooting

Get Harbor Freight Tools 62779 - 30 gal. 420cc Truck Bed Air Compressor EPA III PDF manuals and user guides View all Harbor Freight Tools 62779 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 15 highlights

Safety Setup Troubleshooting Problem Engine will not start Possible Causes COMPRESSOR SPECIFIC: 1. Pilot Valve closed. (Note: See engine manual for engine 2. Tank already pressurized. specific issues.) Likely Solutions COMPRESSOR SPECIFIC: 1. Open pilot valve before start procedure, close after unit is running. 2. Turn engine on. Compressor will turn on as needed when pressure reaches preset level. Compressor overheats 1. Incorrect lubrication or not enough lubrication. 2. Worn parts. 1. Lubricate using recommended oil or grease according to directions. 2. Have qualified technician inspect internal mechanism and replace parts as needed. 1. Poor air outlet seal. 1. Tighten or re-attach using thread seal tape. Severe air leakage 2. Loose cylinder/cylinder head. 2. Tighten cylinder/cylinder head assembly. If cylinder/cylinder head cannot tighten properly, internal parts may be misaligned. 3. Damaged valve or housing. 3. Replace damaged components. 4. Dirty, worn or damaged valve. 4. Clean or replace valve assembly. 1. Low engine idle. 1. Qualified technician should increase idle to 2,200±100 RPM by adjusting pressure switch. Unit stalls 2. Severely clogged air filter. 2. Replace air filter. 3. Improper lubrication. 3. Check for proper oil level. 4. Defective pilot/unloader valve. 4. Replace pilot valve. 1. Loose drive pulley or flywheel. 1. Loose pulleys are a common cause of "knocking". Tighten appropriate bolts. 2. Misaligned pulleys. 2. Align pulleys with straightedge and secure in place. 3. Lack of oil in crankcase. Excessive noise 4. Worn connecting rod. 3. Check for proper oil level. 4. Replace connecting rod. 5. Worn wrist pin bushing. 5. Remove piston assembly and replace necessary parts. 6. Worn bearings. 6. Replace bearings and oil. 7. Loose belts. 7. Check for proper belt tension. 1. Wrong type of oil or lowquality oil. 1. Change oil. Check oil recommendations under EQUIPMENT SET UP, Equipment Oil Fill section of this manual. Oil in the discharge air 2. Overheating. 3. Restricted intake air. 2. See above Excessive Noise section. 3. Clean or replace air filter. 4. Worn piston rings. 4. Replace piston rings. 5. Excessive moisture in the tank. 5. Drain moisture from the tank daily. 1. Air leaks. 1. Listen for escaping air. Apply soap solution to all fittings and connections. Bubbles will appear at points of leakage. Tighten or replace leaking fittings or connections. Low discharge pressure 2. Leaking valves. 2. Remove head and inspect for valve breakage, weak valves, scored valve plate, etc. Replace defective parts and reassemble. Replace head gasket each time the head is removed. 3. Restricted air intake. 3. Clean or replace air filter element. 4. Blown gaskets. 4. Replace and gaskets proven faulty on inspection. 5. Slipping belts. 5. Tighten Belts (See monthly maintenance.) Follow all safety precautions whenever diagnosing or servicing the equipment or engine. Operation Maintenance ITEM 62779 For technical questions, please call 1-888-866-5797. Page 15

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
Page 15
For technical questions, please call 1-888-866-5797.
ITEM 62779
SAFETY
SETUP
OPERATION
MAINTENANCE
Troubleshooting
Problem
Possible Causes
Likely Solutions
Engine will
not start
(Note: See engine
manual for engine
specific issues.)
COMPRESSOR SPECIFIC:
1. Pilot Valve closed.
2. Tank already pressurized.
COMPRESSOR SPECIFIC:
1. Open pilot valve before start procedure,
close after unit is running.
2. Turn engine on. Compressor will turn on as
needed when pressure reaches preset level.
Compressor
overheats
1. Incorrect lubrication or
not enough lubrication.
2. Worn parts.
1. Lubricate using recommended oil or
grease according to directions.
2. Have qualified technician inspect internal
mechanism and replace parts as needed.
Severe air
leakage
1. Poor air outlet seal.
2. Loose cylinder/cylinder head.
3. Damaged valve or housing.
4. Dirty, worn or damaged valve.
1. Tighten or re-attach using thread seal tape.
2. Tighten cylinder/cylinder head assembly.
If cylinder/cylinder head cannot tighten properly,
internal parts may be misaligned.
3. Replace damaged components.
4. Clean or replace valve assembly.
Unit stalls
1. Low engine idle.
2. Severely clogged air filter.
3. Improper lubrication.
4. Defective pilot/unloader valve.
1. Qualified technician should increase idle to
2,200±100 RPM by adjusting pressure switch.
2. Replace air filter.
3. Check for proper oil level.
4. Replace pilot valve.
Excessive noise
1. Loose drive pulley or flywheel.
2. Misaligned pulleys.
3. Lack of oil in crankcase.
4. Worn connecting rod.
5. Worn wrist pin bushing.
6. Worn bearings.
7. Loose belts.
1. Loose pulleys are a common cause of
“knocking”. Tighten appropriate bolts.
2. Align pulleys with straightedge and secure in place.
3. Check for proper oil level.
4. Replace connecting rod.
5. Remove piston assembly and replace necessary parts.
6. Replace bearings and oil.
7. Check for proper belt tension.
Oil in the
discharge air
1. Wrong type of oil or low-
quality oil.
2. Overheating.
3. Restricted intake air.
4. Worn piston rings.
5. Excessive moisture
in the tank.
1. Change oil. Check oil recommendations
under EQUIPMENT SET UP, Equipment
Oil Fill section of this manual.
2. See above Excessive Noise section.
3. Clean or replace air filter.
4. Replace piston rings.
5. Drain moisture from the tank daily.
Low discharge
pressure
1. Air leaks.
2. Leaking valves.
3. Restricted air intake.
4. Blown gaskets.
5. Slipping belts.
1. Listen for escaping air. Apply soap solution
to all fittings and connections. Bubbles will
appear at points of leakage. Tighten or
replace leaking fittings or connections.
2. Remove head and inspect for valve breakage,
weak valves, scored valve plate, etc. Replace
defective parts and reassemble. Replace head
gasket each time the head is removed.
3. Clean or replace air filter element.
4. Replace and gaskets proven faulty on inspection.
5. Tighten Belts (See monthly maintenance.)
Follow all safety precautions whenever diagnosing or servicing the equipment or engine.