Checking Fuel Tightness Of Delivery Valve; Checking Injection Nozzle Spraying Condition - Kubota WSM 05-E4B Series Workshop Manual

SERVICING
4. Checking and adjusting
3. Install the injection nozzle (2) jetted with the proper
injection pressure to the injection pump pressure
tester (1). (Refer to the photo.)
(1) Injection pump pressure test-
er
(2) Injection nozzle
4. Set the speed control lever to the maximum speed
position.
5. Operate the starter to increase the pressure.
NOTE
• If the pressure can not reach the service
limit, replace the pump with a new one or
repair it at a Kubota-authorized pump
service shop.
• Never try to disassemble the injection pump
assembly.
For repairs, you are strongly requested to
contact a Kubota-authorized pump service
shop.
Fuel tightness of
Service limit
pump element
4.11 Checking fuel tightness of
delivery valve
Tools required
• Injection pump pressure tester
1. Remove the injection pipes and glow plugs.
2. Set an injection pump pressure tester (1) to the fuel
injection pump.
3. Install the injection nozzle (2) jetted with the proper
injection pressure to the injection pump pressure
tester (1).
05-E4B SERIES,05-E4BG SERIES
(3) Protection cover for jetted
fuel
13.7 MPa
2
140 kgf/cm
1990 psi
(1) Injection pump pressure test-
er
(2) Injection nozzle
4. Operate the starter to increase the pressure.
5. Stop the starter when the fuel jets from the injection
nozzle (2). After that, turn the flywheel by hands
and raise the pressure to approx. 13.73 MPa
2
(140.0 kgf/cm , 1991 psi).
6. Now turn the flywheel back about half a turn (to
keep the plunger free) and keep the flywheel at this
position.
7. Measure the time until the pressure drops.
NOTE
• If the measurement is less than service limit,
replace the pump with a new one or repair it
at a Kubota-authorized pump service shop.
• Never try to disassemble the injection pump
assembly.
For repairs, you are strongly requested to
contact a Kubota-authorized pump service
shop.
Service specifi-
cation
Fuel tightness of
delivery valve
Service limit
4.12 Checking injection nozzle
spraying condition
CAUTION
• Check the injection pressure and condition after
you make sure that there is nobody standing in
the direction the fume goes.
4. ENGINE
(3) Protection cover for jetted
fuel
10 seconds
From 13.73 to 12.75 MPa
From 140.0 to
2
130.0 kgf/cm
From 1991 to 1849 psi
5 seconds
From 13.73 to 12.75 MPa
From 140.0 to
2
130.0 kgf/cm
From 1991 to 1849 psi
4-23
KiSC issued 03, 2023 A