Bradco CONTRACTOR 408A BACKHOE, Operator'S & Parts Manual, Page: 39 / 142

TROUBLESHOOTING
PROBLEM POSSIBLE CAUSE REMEDY
Backhoe fails to lift or Low oil supply Add oil
swing
Improper hose hookup Check hydraulic dia-
gram; reinstall properly
Worn control valve Replace section
section
Pump damaged or Replace pump
worn
Broken hydraulic line Check for leaks and re-
place line
Jammed swing linkage Remove interference
Bent cylinder rod Replace or repair
cylinder
Swing speed control Open swing speed
completely closed control valve
Backhoe lifting or swing- Cold oil Warm oil with engine at
ing too slowly idle speed
Engine speed too slow Open throttle
Oil leaking past control Replace or repair worn
valve section
Oil too heavy Use recommended oil
Pump damaged or Replace or repair pump
worn
Oil leaking past Replace packings
cylinder packings
Dirty oil filter Replace filter
Faulty relief valve Clean or replace
Incorrect restrictors in Check restrictor orifice
valve size with those shown
on valve assembly page
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