Kubota B1830, Workshop Manual, Page: 233 / 548

TRANSMISSION B1830,B2230,B2530,B3030, WSM
3-S9
(2) HST
Charge Pressure
CAUTION
• When checking, park the tractor on flat ground and fully
engage the parking brake.
1. Remove the lowering speed adjusting knob and the seat under
cover.
2. Remove the plug from P1 port (reverse) or P2 port (forward).
NOTE
• If the plug is tight to remove, warm up the plug by a hair
drier etc..
3. Install the adaptor (4) to P1 port (1) or P2 port (2).
4. Install the cable (3) and low pressure gauge to the adaptor (4).
5. Start the engine and warm the oil before testing.
6. Change the range gear shift lever (5) to
"NEUTRAL" position.
7. Run the engine at the rated speed.
8. Release the foot from the HST pedal (6).
9. Read the low pressure gauge to measure the charge relief
pressure.
10. If the measurement is not same as factory specification, check
the charge relief valve and the related hydraulic components.
NOTE
• Low pressure gauge is 2.9 MPa (30 kgf/cm
2
, 427 psi) full
scale.
(When reassembling)
• Apply liquid lock (Three Bond 1375N or its equivalent) to the
plug.
9Y1210003TRS0005US0
Engine speed Rated speed
Range gear shift position Neutral
HST pedal Neutral
Charge pressure Factory specification
0.4 to 0.6 MPa
4.1 to 6.1 kgf/cm
2
17.4 to 20.2 psi
Tightening torque Checking port plug
30 to 44 N·m
3.0 to 4.5 kgf·m
22 to 33 lbf·ft
(1) P1 Port (Reverse)
(2) P2 Port (Forward)
(3) Cable
(4) Adaptor
(5) Range Gear Shift Lever
(6) HST Pedal
L: Low Speed Position
M: Medium Speed Position
N: Neutral Position
H: High Speed Position
KiSC issued 05, 2012 A