16572000_ed2
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not overheat. After the initial period of low-pressure operation, check
the performance of the reconditioned Jackhamer with that of a new
jackhamer by comparing its speed under similar conditions and with
normal air pressure. Once testing is completed, install plastic plugs or
caps in all ports to keep out dirt until the tool is back in service.
Troubleshooting Guide
Trouble
Probable Cause
Solution
Jackhamer will not start
Plugged exhaust port or air passages
caused by dirt or hose particles.
Dismantle Jackhamer, clean out all ports and air passages.
Keep the air hose in good condition; never use a soft
deteriorated hose.
Stuck valve due to gummy oil or incorrect
assembly.
Remove Backhead completely. Dismantle Valve and clean
parts. Never use dirty oil or oil that does not conform to the
recommended specifications.
Frozen piston due to improper lubrication.
Dismantle Jackhamer to remove piston. Repair piston by
placing in a high speed lathe and dressing with fine emery
cloth. Never run Jackhamer without the proper lubricating oil
in the air line lubricator.
Side Rods tightened unevenly, causing
binding.
Check Jackhamer for correct assembly and retighten Side
Rods evenly. Torque Side Rod Nuts between 30 and 35 ft-lb.
(40.7 and 47.5 Nm) torque.
Jackhamer loses power
rapidly
Restriction in air supply line.
Never allow the air supply to kink or make sharp bends.
Air supply line too long.
As a general rule, keep the air supply line under 50 ft. (15 m).
Diameter of air supply line too small.
A 3/4 in. (19 mm) diameter air supply is recommended for
the Jackhamer.
Freezing at exhaust ports
Excessive moisture in the air supply line
Install moisture traps in the air supply line or add antifreeze
lubricant directly through the air inlet. Use “KILFROST”* anti-
freeze lubricant or equivalent.
Jackhamer lacks power
Low air supply pressure.
The air supply pressure at the inlet should be 90 to 100 psi
(6.2 to 6.9 bar).
Running on fronthead cushion.
Keep shank fed-up to the work. Always maintain a constant
pressure when operating the Jackhamer.
Plugged air passages.
Dismantle the Jackhamer and clean out all ports and
passages.
Lack of lubricating oil.
Maintain the proper oil level in the air line lubricator. Steel
shank must show a film of oil.
Short Drill Steel shank due to wear or
regrinding.
Replace Drill Steel if shank is worn excessively.
Worn components.
Check and replace parts that show wear.
Jackhamer will not start
Plugged exhaust port or air passages
caused by dirt or hose particles.
Dismantle Jackhamer, clean out all ports and air passages.
Keep the air hose in good condition; never use a soft
deteriorated hose.
Fogging
Excessive moisture in the air supply line.
Blow out air lines. If moisture traps are installed in the air
supply line, drain the moisture.
Overheating of Jackhamer
Over lubrication.
Adjust the air line lubricator for proper rate of feed.
Running on fronthead cushion.
Keep shank or hammer block fed-up to work. Always
maintain constant pressure when operating the Jackhamer.
Lack of lubrication or improper lubricating
oil.
Before operating the Jackhamer make sure the air line
lubricator is full of proper lubricant.
Piston not hitting the shank because of
short shank.
Remove the Drill Steel with the short shank from the
Jackhamer and install a new Drill Steel.
Pulling Drill Steel at full throttle.
When pulling Drill Steels, always use minimum throttle.
Summary of Contents for Jackhamer JRD50
Page 7: ...Notes...
