Great Plains 3P300 Operator Manual - Manual (Page 46)

500-103M-A 09/14/2009
42 3P300 S/N HH1113+ Great Plains Manufacturing, Inc.
Troubleshooting
Problem
Problem
Area
Specific Checks Solutions
Pressure
decreasing Between
gauge and liq-
uid supply Pump wearing Rebuild or replace pump
Plugged suction or pump to pres-
sure head hose Clean hose and reduce cause of clogging
Plugged Whirlfilter See “Whirlfilter® Clean-Out” on page 44.
Plugged gauge Remove the quick disconnect fitting and flush
gauge protector
Pressure
fluctuating Between pump
outlet and liq-
uid Check suction hose & fittings for
air leaks. Air in system is indi-
cated by buffs of air at nozzles Remove obstruction from clogged area
Vortex in tank suction Align agitators properly
Cracked pump housing Replace pump housing
Pressure
increasing Between
gauge and
nozzle Nozzle screens clogged Clean screens
Nozzle orifices plugged Remove material with soft brush or air
Boom hoses becoming clogged Remove obstruction from clogged area
Boom hoses pinched Use cable ties to position hose so it will not
kink
Pressure
cannot
increase Pump or elec-
tric ball valve From nozzle charts check liquid
demand against pump capacity
(nozzle requirement + agitation
requirement) Reduce swath width by nozzle reduction;
install smaller nozzles and drive at a lower
rate of speed
Electric ball valve or gauge not
functional Replace or repair
Pressure adjust switch faulty Test switch & replace if faulty
Fuse is out in control box Replace fuse
Manual pressure adjustment
valve not all the way open Open the manual pressure valve all the way
and allow the electric ball valve to govern the
pressure
No pressure Plumbing Tank shut-off valves off Make sure all tank shut-off valves are open
Loose fittings Tighten fittings so pump can prime
Collapsed suction hose to pump Replace hose
Obstruction in suction hose or
tank Remove obstruction
No pressure Pump Hydraulic pump running in the
wrong direction Switch hydraulic hoses in the tractor outlet
PTO pump coupler loose Tighten PTO coupler