SECTION 88 - ACCESSORIES
88-16
HIGH FLOW HYDRAULICS TROUBLESHOOTING
PROBLEM
POSSIBLE CAUSE CORRECTION
No switch operation No battery voltage to switch
Inoperative switch
Check power supply at 15-amp
fuse (attachment) engine fuse
panel
Check DKGN/R (Dark Green/Red)
wire from fuse to switch
Replace switch
No selector valve operation No battery voltage to selector valve
No circuit ground
No selector valve spool movement
Check switch for proper operation
Check W/T (White/Tan) wire from
switch to selector valve
Check B (Black) ground wire for
proper grounding
Check valve spool for binding and
sticking
Hydraulic oil overheats Using 1/2″ quick couplers
Control valve and boom steel lines
and hoses were not changed from
5/8″ to 3/4″
Operating high flow when not
required
Operating high flow at relief
pressure continuously
Operating attachment when not
applying a load to the attachment
Operating attachment when high oil
flows are not required
Restriction in pressure or return
lines
Oil cooler restricted not allowing
cooling air to flow properly
Must use 3/4″ quick couplers
Change lines and hoses to 3/4″
Turn high flow switch to the “OFF”
position
Operate attachment at lesser load
Stop attachment when not loaded
(moving from one work area to
another)
Turn high flow switch to the “OFF”
position
Check and repair
Clean oil cooler and radiator
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