System Operating Hot; System Will Not Operate In Either Direction - Danfoss Series 20 Service Manual And Repair Instructions

Service Manual and
Repair Instructions
Troubleshooting

System Operating Hot

Check fluid
level in OK
reservoir
to Low
Fill to
proper level
System will not Operate in
either Direction
Check fluid
Check control
level in OK
reservoir
to Low
Fill to
propper level
OK
(see Series20 Axial Piston
Pumps, Service Manual
and Repair Instruction)
Repair or replace
(see Series20 Axial Piston
Pumps, Service Manual
and Repair Instruction)
transmission
(pump + motor)
Axial Piston Motors Series 20
Inspect heat
OK
exchanger inlet filter
Defective
Repair
or replace
Inspect motor
OK by-pass valve
linkage
Defective
Defective
Repair
or replace or replace
Inspect
charge pump
OK
inlet filter
Defective Defective
Replace
control valve
OK
(see Series20 Axial Piston
Pumps, Service Manual
and Repair Instruction)
Defective
control valve
(see Series20 Axial Piston
Pumps, Service Manual
and Repair Instruction)
L1003443 • Rev BA • Jun 2014
Inspect motor
Inspect
OK by-pass valve
(if used)
Clogged Defective
Repair
Replace
or replace
Check charge
pressure
OK
(see Series20 Axial Piston
Pumps, Service Manual
(if used)
and Repair Instruction)
to low in
neutral and
forward or
Repair
reverse
Inspect charge
pressure relief valve
Inspect
OK
(see Series20 Axial Piston
Pumps, Service Manual
and Repair Instruction)
Clogged
Repair or replace
(see Series20 Axial Piston
Replace
Pumps, Service Manual
and Repair Instruction)
Inspect
Inspect motor
OK by-pass valve
(if used)
Defective
Replace
Repair
or replace
Check system
OK pressure
(see page 13)
Defective
Reduce
machine load
Replace
transmission
(pump + motor)
OK
to low in
forward or
reverse
to low in
neutral
Inspect purge
relief valve
at motor
(see page 21)
Defective
Repair or
replace the
valve block
(see page 19)
Check system
OK pressure
(see page 13)
OK
13