Challenge EH-3D - Troubleshooting

8.0 Maintenance Guide
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8.1 Troubleshooting
DISCONNECT THE POWER AND LOCK IT OUT whenever working on
the machine unless the instructions specifically require the machine to be powered (see Power
Lockout Procedure, page 5). Some of the following tests may require the machine to be operational
for checking and adjusting. Be very careful that tools and other people are clear of moving parts, and
that the drill is not accidentally operated while adjustments are being made.
Whenever repairing hydraulic components, loosen connections slowly to
bleed off any trapped pressure.
Problem
Area to Check
Solution
1. No power
Power to machine
Tripped Circuit Breaker
Connect power
Reset Circuit Breaker
2. Lack of power
Relief valve in pump may be bad
or have dirt in it
Check oil level – may be low
Check voltage at machine – may
be low
Clean or replace relief valve or
pump
Add oil
Remove other machinery on line
or provide a dedicated line
3. Drill head won’t return
Check lift springs – may be
broken or stuck (replace if
necessary).
Pull down shafts froze in frame.
Pry up head, clean & oil shafts
Pry up head, clean & oil shafts
4. Drill head won’t come down
Check for broken lift spring – may
be jammed
Speed control valve out of
adjustment or defective
Replace spring
Try to readjust, may have to
replace
5. Spindle motor stalls
Dull drills
Check for low voltage
Drive belt may be loose
Check for paper plugging drills
Sharpen drills
(See above)
Adjust belt tension (See
Adjustment section of this
manual)
Clean out hollow drills – We
recommend cleaning and soaking
drills in oil overnight