Husqvarna PT26D Workshop Manual page 133

Trouble shooting with pressure and flow
measurement
Stated pressures are nominal values. Certain
deviations as a result of temperature, viscos-
ity and friction are normal. The guideline val-
ues stated are meant to give an idea of
whether you're in the appropriate range
Feed pressure 1.8 MPa (18 bar)
Connect manometer 0-2.5 MPa (0-25 bar) to
the axial piston pump's test socket P1. P1 is
the socket with a pre-mounted angled nipple.
Nipple type, see "Measuring nipple kit" on
page 10. Star the engine, pressure guideline
value 1.7-1.8 MPa (17-18 bar) at full speed
and in neutral.
The pressure limiting valve is located at the
base of the axial piston pump and is not
adjustable. Too low feed pressure can be due
to contaminations between cone and seat.
Steering unit and steering cylinder
Connect manometer 0-15 MPa (0-150 bar)
to test socket P2 on the conductor at the out-
let of the bearing pump.
Start the engine, pressure guideline value
2.4 MPa (24 bar). Turn the steering wheel to
its end position in both directions. Pressure
guideline value 12.8-13 MPa (128 -130 bar)
and equal in both cases.
Piston gasket in the lift cylinder
Connect manometer 0-15 MPa (0-150 bar) to
test socket P2 on the conductor at the outlet
of the bearing pump.
If pressure during max speed operation of the
cutting unit does not reach approx. 12-13 MPa
(120-130 bar), there may be a leak in the
piston gasket.
Close the centre solenoid valve on the valve
block working hydraulic by disconnecting the
electric cable from the solenoid valve. Start
the engine and lift. If the pressure now rises
to 12 MPa (120 bar), the cylinder gasket is
defective.
132
English-
TROUBLE SHOOTING
Test socket P1. The socket is located on the right side of
the axial piston pump.
The pressure limiting valve is located at the base of the
axial piston pump.
Test socket P2
IMPORTANT INFORMATION
ENVIRONMENTAL HAZARD! Avoid spill-
age during hydraulic measurements.
Waste oil shall be treated as environmen-
tally hazardous and turned in to the work-
shop or other designated area for disposal.
Avoid skin contact; wash with soap and
water in case of spills.
8043-244
Axial piston pump
Pressure limiting
valve, parts
8043-114
8043-245