Troubleshooting; System Response Is Sluggish - Danfoss 20 Series Service Manual

Service Manual and
Repair Instructions

Troubleshooting

Transmission Operates in
one Direction Only

System response is sluggish

Check charge
pressure OK control valve
(see page 14) (see page 15)
to low
in control valve
neutral
(see page 23)
to low inforward
or reverse
Inspect charge
relief valve at motor
pressure
(see Series 20 Axial Piston
relief valve
Motors, Service Manual
(see page 14)
and Repair Instruction)
Defective
Repair or replace
Repair
the valve block
or replace
(see Series 20 Axial Piston
Motors, Service Manual
(see page 21, 22)
and Repair Instruction)
12
Axial Piston Pumps Series 20
Check control
linkage
Defective
Repair
or replace
Inspect Inspect motor
OK by-pass valve
Defective Defective
Replace
or replace
to low in neutral and
forward or reverse
Inspect purge
Inspect charge
relief valve
(see page 14)
Defective Defective
or replace
(see page 21, 22)
L1003506 • Rev BA • Jun 2014
Inspect high pressure
relief valve
OK
(see Series 20 Axial Piston
Motors, Service Manual
and Repair Instruction)
Defective
Repair or replace
(see Series 20 Axial Piston
Motors, Service Manual
and Repair Instruction)
Inspect shuttle valve
in valve block
(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)
Replace
OK transmission
(if used) (pump + motor)
Repair
Inspect
pressure
OK
inlet filter
Clogged
Repair
Replace
Insert charge
OK check valves
(see page 14)
Defective
Repair
or replace
(see page 21,22)
Inspect control valve
OK
(see page 15)
Defective
Replace control valve
(see page 23)
Inspect
OK charge pump
(see page 14)
Defective
Repair
or replace
(see page 21, 22)
OK
OK