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

NEUTRAL DIFFICULT OR IMPOSSIBLE TO FIND

Check control
linkage
Defective
Repair
or replace

SYSTEM WILL NOT OPERATE IN EITHER DIRECTION

Check fluid
level in OK
reservoir
to low
Fill to
propper level
OK
(see page 21, 22)
(pump + motor)
Series 20 – Axial Piston Pumps
Service Manual and Repair Instructions
Trouble Shooting
Inspect control valve
OK
(see page 15)
Defective
Replace control valve
(see page 23)
Inspect motor
Check control
OK by-pass valve
linkage
Defective
Repair
or replace
Inspect
charge pump
OK
(see page 14)
Defective
Repair
or replace
Replace
transmission OK control valve
(see page 15)
control valve
(see page 23)
DKMH.PS.315.B1.02 520L0535
Replace
OK
pump
Check charge
OK pressure
(if used) (see page 14)
Defective
to low in
neutral and
forward or
Repair reverse
or replace
Inspect charge
Inspect
pressure
OK
relief valve
inlet filter
(see page 14)
Defective Clogged
Replace or replace
(see page 21, 22)
Inspect Inspect motor
OK by-pass valve
Defective Defective
Replace
or replace
OK
to low in
forward or
reverse
to low in
neutral
Inspect purge
relief valve at motor
(see Series 20 Axial Piston
Motors, Service Manual
and Repair Instruction)
Defective
Repair or replace
Repair
the valve block
(see Series 20 Axial Piston
Motors, Service Manual
and Repair Instruction)
Check system
OK
(see Series 20 Axial Piston
Motors, Service Manual
(if used)
and Repair Instruction)
Repair
pressure
13