Charge Relief Pressure And High Relief Pressure; Charge Relief Pressure; High Relief Pressure - Kubota B2410 Workshop Manual

82410 • 82710 • 82910 WSM, 12271
3 TRANSMISSION
Charge Relief Pressure and High Relief Pressure
A
CAUTION
• When checking, park the tractor on flat ground and fUlly
engage the parking brake.
1. Remove the lowering speed adjusting knob and dipstick, then
remove the seat under cover.
2. Assemble the HST adaptor A and threaded joint with O-ring and
back up ring (Refer to G-38).
• Charge Relief Pressure
1. Remove the neutral valve assembly one side (forward (1) or
reverse (2)) then install the assembled HST adaptor A to its
neutral valve port.
2. Install the cable and low pressure gauge to HST adaptor A.
3. Change the range gear shift lever to Low position. '
4. Start the engine and run it at the maximum speed.
5. Read the low pressure gauge to measure the charge relief
pressure.
6. If the measurement is not same as factory specification, check
the charge relief valve and related hydraulic components.
• High Relief Pressure
1. Remove the neutral valve assembly forward (1), then install the
assembled HST adaptor A to its neutral valve port.
2. Install the cable and high pressure gauge to HST adaptor A.
3. Change the range gear shift lever to High position.
4. Start the engine and run it at the maximum speed.
5. Depress the speed control pedal forward and read the high
pressure gauge to measure the forward high relief pressure.
6. Stop the engine and change the installation of HST adaptor A and
pressure gauge from forward neutral valve port to reverse.
7. Start engine and repeat above method (4. and 5.) to measure the
reverse high relief pressure.
8. If the measurement is not same as factory specification, check
the high pressure relief valve and related hydraulic components.
Factory spec. 500 to 800 kPa
Charge relief pressure
(Oil temperature at 50 5.1 to 8.2 kgf/cm
2
°C, 122 OF)
73 to 116 psi
Factory spec. 30.9 to 31.9 MPa
High relief pressure (Oil temperature at 50 315 to 325 kgf/cm
2
°C, 122 OF)
4480 to 4622 psi
58.8 to 68.6 N·m
Tightening torque Neutral valve cap screw
6.0 to 7.0 kgf·m
43.4 to 50.6 ft-Ibs
• IMPORTANT
• Measure quickly so that the high pressure relief valve may
not be in operation more than 10 seconds.
• NOTE
• High pressure gauge is 40 MPa (400 kgf/cm
2
,
5800 psi) full
scale.
• Low pressure gauge is 2 MPa (20 kgf/cm
2
,
290 psi) full scale.
• When reinstall the neutral valve, take care not to damage
the O-ring.
(1) Neutral Valve (Forward)
3-S9
(2) Neutral Valve (Reverse)
12490830420