12
Transmission Operates in
one Direction Only
Troubleshooting
Check control
linkage
Repair
or replace
Inspect high pressure
relief valve
(see page 13)
Insert charge check valves
(see Series 20 Axial Piston
Pumps, Service Manual
and Repair Instruction)
Repair
or replace
(see page 20,21)
Inspect shuttle valve
in valve block
(see page 14)
Repair or replace
the valve block
(see page 19)
OK
DefectiveDefective
OK OK
Repair or replace
(see Series 20 Axial Piston
Pumps, Service Manual
and Repair Instruction)
Inspect control valve
(see Series 20 Axial Piston
Pumps, Service Manual
and Repair Instruction)
Replace control valve
(see Series 20 Axial Piston
Pumps, Service Manual
and Repair Instruction)
Defective
Defective Defective
OK
System response is sluggish
Check charge
pressure
(see Series20 Axial Piston
Pumps, Service Manual
and Repair Instruction)
Inspect
control valve
(see Series20 Axial Piston
Pumps, Service Manual
and Repair Instruction)
Inspect motor
by-pass valve
(if used)
Replace
control valve
(see Series20 Axial Piston
Pumps, Service Manual
and Repair Instruction)
OK
Defective
OK
OK
Repair
or replace
Defective
Replace
transmission
(pump + motor)
OK
Inspect charge
pressure relief valve
(see Series20 Axial Piston
Pumps, Service Manual
and Repair Instruction)
Repair or replace
(see Series20 Axial Piston
Pumps, Service Manual
and Repair Instruction)
Inspect purge
relief valve
at motor
(see page 21)
Inspect charge
pressure relief valve
(see Series20 Axial Piston
Pumps, Service Manual
and Repair Instruction)
Repair or
replace the
valve block
(see page 19)
DefectiveDefective
Repair or replace
(see Series20 Axial Piston
Pumps, Service Manual
and Repair Instruction)
Defective
Inspect
inlet filter
OK
OK
Replace
Clogged
Inspect
charge pump
(see Series20 Axial Piston
Pumps, Service Manual
and Repair Instruction)
Repair or replace
(see Series20 Axial Piston
Pumps, Service Manual
and Repair Instruction)
Defective
to low
in
neutral
to low in neutral and
forward or reverse
to low inforward
or reverse
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