Great Plains TM700 Operator Manual - Manual (Page 55)

5/13/2003 500-052M
53 Troubleshooting
Troubleshooting
Area of Concern
Problem
Area
Specific Checks Corrections
Pressure
Decreasing
Between
gauge &
liquid
supply 1. Pump wearing.
2. Plugged suction or pump to pressure
head hose.
3. Plugged Whirlfilter ® .
4. Plugged gauge.
1. Rebuild or replace pump.
2. Clean hose and reduce cause of
clogging.
3. Clean out Whirlfilter ® , refer to
page 26.
4. Open gauge clean-out valve and
flush gauge protector.
Pressure
Fluctuating
Between
pump out-
let & liquid 1. Check suction hose & fittings for air
leaks. Air in system is indicated by
buffs of air at nozzles.
2. Vortex in tank suction.
3. Cracked pump housing.
1. Remove obstruction from clogged
area.
2. Align agitator properly.
3. Replace pump housing.
Pressure
Increasing
Between
gauge &
nozzle 1. Nozzle screens clogged.
2. Nozzle orifices plugged.
3. Boom hoses becoming clogged.
4. Boom hoses pinched.
1. Clean screens.
2. Remove material with soft brush or
air.
3. Remove obstruction from clogged
area.
4. Use cable ties to position hose so it
will not kink.
Pressure
Cannot
Increase
Pump or
electric ball
valve 1. From nozzle charts check liquid de-
mand against pump capacity {Nozzle
requirement + agitation require-
ment}.
2. Electric ball valve or gauge not func-
tional.
3. Pressure adjust switch faulty.
4. Fuse is out in the control box.
5. Manual pressure adjustment valve
not all the way open.
1. Reduce swath width by nozzle re-
duction; install smaller nozzles &
drive at a lower rate of speed.
2. Replace or repair.
3. Test switch & replace if faulty.
4. Replace fuse.
5. Open the manual pressure valve
all the way & allow the electric ball
valve to govern the pressure.
No
Pressure
Plumbing 1. Tank shut-off valves off.
2. Loose fittings.
3. Collapsed suction hose to pump.
4. Obstruction in suction hose or tank.
1. Make sure all tank shut-off valves
are open.
2. Tighten fittings so pump can
prime.
3. Replace hose.
4. Remove obstruction.
No
Pressure
Pump 1. Hydraulic pump running in the wrong
direction.
2. PTO pump coupler loose.
1. Switch hydraulic hoses in the trac-
tor outlet.
2. Tighten PTO coupler.
Pressure
Cannot
Decrease
Pump or
electric ball
valve 1. Tank agitation restricted. 1. Check that the agitator valve is
open & that the liquid is being agi-
tated.