Gardner Denver GD 70 Parts List, Operating & Service Manual page 12

EN
PROBLEM
High oil consumption
Knocking or rattling
Moisture in crankcase or "milky" appearance
in petroleum lubricant or rusting in cylinders
Oil in discharge air (oil pumping)
Oil leaking from shaft seal
Safety/relief valve "pops"
EN-12
POSSIBLE CAUSE
Clogged or dirty inlet and/or discharge line
filter.
Lubricant viscosity too low
Detergent type lubricant being used
Piston rings damaged or worn (broken, rough
or scratched). Excessive end gap or side
clearance
Piston rings not seated, are stuck in grooves
or end gaps not staggered
Cylinder(s) or piston(s) scratched, worn or
scored
Connecting rod, piston pin or crankpin
bearings worn or scored
Crankshaft seal worn or crankshaft scored
Worn cylinder finish
Compressor valves leaky, broken, carbonized
or loose.
Carbon build-up on top of piston(s).
Cylinder(s) or piston(s) scratched, worn or
scored
Connecting rod, piston pin or crankpin
bearings worn or scored
Defective ball bearings on crankshaft or
motor shaft.
Detergent type lubricant being used
Extremely light duty cycles
Unit located in damp or humid location
Lubricant viscosity too low
Detergent type lubricant being used
Piston rings damaged or worn (broken, rough
or scratched). Excessive end gap or side
clearance
Piston rings not seated, are stuck in grooves
or end gaps not staggered
Cylinder(s) or piston(s) scratched, worn or
scored
Worn cylinder finish
Crankshaft seal worn or crankshaft scored
Clogged or dirty inlet and / or discharge line
filter
Compressor valves leaky, broken, carbonized
or loose.
Defective safety/relief valve
POSSIBLE SOLUTION
Clean or replace
Drain existing lubricant and refill with proper
lubricant
Drain existing lubricant and refill with proper
lubricant
Install ring kit
Adjust piston rings
Repair or replace as required
Inspect all. Repair or replace as required
Replace seal air crankshaft assembly
Deglaze cylinder with 180 grit flex-hone
Inspect valves. Clean or replace as required.
Install valve kit
Clean piston(s). Repair or replace as required.
Repair or replace as required
Inspect all. Repair or replace as required
Inspect bearings and replace crankshaft
assembly if required
Drain existing lubricant and refill with proper
lubricant
Run unit for longer duty cycles
Relocate unit
Drain existing lubricant and refill with proper
lubricant
Drain existing lubricant and refill with proper
lubricant
Install ring kit
Adjust piston rings
Repair or replace as required
Deglaze cylinder with 180 grit flex-hone
Replace seal air crankshaft assembly
Clean or replace
Inspect valves. Clean or replace as required.
Install valve kit
Replace
HYD-7-610