Neutral Difficult Or Impossible To Find; System Will Not Operate In Either Direction - Danfoss 20 Series Service Manual

Service Manual and
Repair Instructions
Troubleshooting
Neutral Difficult or
Impossible to Find
System will not Operate in
either Direction
Check fluid
Check control
level in OK
reservoir
to low
Fill to
propper level
charge pump
OK
(see page 14)
(see page 21, 22)
transmission
(pump + motor)
Axial Piston Pumps Series 20
Check control
linkage
Defective
Repair
or replace
Inspect motor
OK by-pass valve
linkage
(if used)
Defective Defective
Repair Repair
or replace or replace
Inspect
Inspect
OK
inlet filter
Defective Defective
Repair
or replace Replace
Replace Inspect
OK control valve
(see page 15)
Defective
Replace
control valve
(see page 23)
L1003506 • Rev BA • Jun 2014
Inspect control valve
OK
(see page 15)
Defective
Replace control valve
(see page 23)
Check charge
OK pressure
(see page 14)
to low in
neutral and
forward or
reverse
to low in
neutral
Inspect charge
pressure
OK
relief valve
(see page 14)
Clogged
Repair
or replace
(see page 21, 22)
Inspect motor
OK by-pass valve
(if used)
Defective
Repair
or replace
Replace
OK
pump
OK
to low in
forward or
reverse
Inspect purge
relief valve at motor
(see Series 20 Axial Piston
Motors, Service Manual
and Repair Instruction)
Defective
Repair or replace
the valve block
(see Series 20 Axial Piston
Motors, Service Manual
and Repair Instruction)
Check system
pressure
OK
(see Series 20 Axial Piston
Motors, Service Manual
and Repair Instruction)
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