Troubleshooting; Transmission Operates In One Direction Only; System Response Is Sluggish - Danfoss Series 20 Service Manual And Repair Instructions

Service Manual and
Repair Instructions

Troubleshooting

Transmission Operates in
one Direction Only

System response is sluggish

Check charge
pressure
OK
(see Series20 Axial Piston (see Series20 Axial Piston
Pumps, Service Manual Pumps, Service Manual
and Repair Instruction) and Repair Instruction)
to low
in
(see Series20 Axial Piston
neutral Pumps, Service Manual
and Repair Instruction)
to low inforward
or reverse
Inspect purge
Inspect charge
pressure relief valve
(see Series20 Axial Piston
Pumps, Service Manual
(see page 21)
and Repair Instruction)
Defective
Repair or replace
(see Series20 Axial Piston
Pumps, Service Manual
(see page 19)
and Repair Instruction)
12
Axial Piston Motors Series 20
Check control
linkage
Defective
Repair
or replace
Inspect
Inspect motor
control valve
OK by-pass valve
(if used)
Defective Defective
Replace
control valve
or replace
to low in neutral and
forward or reverse
Inspect charge
pressure relief valve
relief valve
(see Series20 Axial Piston
at motor
Pumps, Service Manual
and Repair Instruction)
Defective Defective
Repair or
Repair or replace
replace the
(see Series20 Axial Piston
valve block
Pumps, Service Manual
and Repair Instruction)
L1003443 • Rev BA • Jun 2014
Inspect high pressure
OK relief valve
(see page 13)
Defective
Repair
or replace
(see page 20,21)
Inspect shuttle valve
in valve block
(see page 14)
Defective
Repair or replace
the valve block
(see page 19)
Replace
OK transmission
(pump + motor)
Repair
Inspect
OK
inlet filter
Clogged
Replace
Insert charge check valves
(see Series 20 Axial Piston
OK
Pumps, Service Manual
and Repair Instruction)
Defective
Repair or replace
(see Series 20 Axial Piston
Pumps, Service Manual
and Repair Instruction)
Inspect control valve
(see Series 20 Axial Piston
OK
Pumps, Service Manual
and Repair Instruction)
Defective
Replace control valve
(see Series 20 Axial Piston
Pumps, Service Manual
and Repair Instruction)
Inspect
charge pump
OK
(see Series20 Axial Piston
Pumps, Service Manual
and Repair Instruction)
Defective
Repair or replace
(see Series20 Axial Piston
Pumps, Service Manual
and Repair Instruction)
OK
OK