Injector Nozzles; Testing And Locating Faulty Nozzle; Governor And Fuel Camshaft - Kubota L185 Shop Manual

Paragraphs 48-52
nuts, align control rack pin with slot in
crankcase (Fig. 60) and lift pump
assembly from crankcase. Do not lose or
damage shim pack located between
pump fiange and crankcase. Shims con-
trol pump timing and same number of
shims must be reinstalled unless timing
is to be changed.
When reinstalling pump, be sure to
guide rack control pin into notch in
governor arm and crankcase. Use
removed shim pack unless timing is to be
changed. Bleed air from system as
previously outlined.
48. GOVERNOR LINKAGE AD-
JUSTMENT. High speed adjustment
screw (2-Fig. 62) and maximum fuel
limit stop (1 or lA) should not normally
require adjustment unless governor or
injection pump is overhauled. Ad-
justments should be made by qualified
personnel only.
Recommended slow idle speed is 800
to 850 rpm for all models. Adjustment is
made by turning slow idle stop (3). High
idle speed should be 2550 rpm for
Model L285; 2750 rpm for Models
L235, L275 and L355 and 2950 rpm for
Models L185, L245, L295, L305 and
L345. Turn high idle stop screw (2) for
adjustment.
49. GOVERNOR AND FUEL
CAMSHAFT. Governor assembly can
be removed with the drive gear and fuel
camshaft as a unit after removing injec-
tion pump, fuel feed pump (if so equip-
ped), timing gear cover as outlined in
paragraph 31, and hydraulic pump and
drive gear from rear end of fuel cam-
1 3
shaft. Remove governor mounting cap
screws and withdraw governor and cam-
shaft as an assembly.
To disassemble, remove fork pivot
shaft (18-Fig. 62A) and separate fork
levers (21 and 22) and fork lever holder
(24). Remove drive gear retaining ring
(1), then remove gear and weight
assembly (2 through 8) using a suitable
puller. (Governor weight thrust bearing
(6) contains 39 loose balls. Be careful
that none are lost when weight unit is
disassembled.
Examine cupped race (5), balls (4) and
ball travel surface on back of gear for
furrowing or pitting and renew if
damaged. Inspect fuel camshaft and
bearings for scoring, wear or other
damage and renew as necessary.
Reassemble by reversing the
disassembly procedure. Be sure
hydraulic pump drive gear is installed
with hub facing forward. Bleed air from
system, check timing and adjust gover-
nor linkage as previously outlined.
INJECTOR NOZZLES
WARNING. Fuel leaves injector nozzle
with sufficient force to penetrate the skin.
When testing, keep exposed portions of
your body clear of nozzle spray and wear
suitable eye protection. Make sure testing
is performed in a well vented area.
All Models
50. TESTING AND LOCATING
FAULTY NOZZLE. If engine does not
run properly and a faulty injection noz-
zle is suspected, check for faulty nozzle
Fig. 62A—Expioded view of
engine governor assembly
and fuel camshaft. On some
models, torque rise adjust-
ment screw (19) is included
In maximum fuel stop
assembly (lA-Flg. 60),
1. Snap ring
2. Injection pump gear
3. Ball guide
4. Baits
5. Sleeve
6. Thrust bearing (39 balls)
7 .Case
8. Retaining rings
9. Bearing retainer
10. Bearing
11. Key
12. Fuel camshaft
13. Bearing
14. Injection pump
15. Shims
16. Governor lever
17. Governor spring
18. Pivot shaft
19. Torque rise adjuster
20. Start spring
21. Governor lever
22. Fork !ever
23. Pivot pins
24. Pivot block
KUBOTA
as follows: With engine running at slow
idle speed, loosen injector line at each
nozzle in turn to allow fuel to escape at
union rather than enter the cylinder. As
in checking spark plugs in a spark igni-
tion engine, the faulty nozzle is the one
that least affects engine operation when
its fuel line is loosened.
Remove and test suspected nozzle (or
install a new or reconditioned unit) as
outlined in appropriate following
paragraphs.
51. REMOVE AND REINSTALL.
Before removing an injector, throughly
clean injector, lines and surrounding
area. Remove high pressure fuel line and
disconnect bleed line. Unscrew nozzle
holder from its mounting position on
cylinder head.
When reinstalling injector, make sure
seating surface in cylinder head is com-
pletely clean and free from carbon build-
up. Use a new seal washer underneath
nozzle holder and tighten to 30-49 N*m
(22-36 ft.-lbs.) torque.
52. TESTING. A complete job of
testing and adjusting injector requires
use of special test equipment. Only
clean, approved testing oil should be us-
ed in tester tank. Nozzle should be
tested for opening pressure, nozzle
leakage and spray pattern.
Before conducting test, operate tester
lever until fuel fiows, then attach injec-
tor. Close valve to tester gage and pump
tester lever a few quick strokes to clear
air from tester and to be sure nozzle
valve is not stuck. Nozzle should open
with a buzzing sound and cut off quickly
at end of injection.
OPENING PRESSURE. Open valve
to tester gage and operate tester lever
slowly while observing gage reading.
Opening p r e s s u r e should be
13730-14700 kPa (1990-2135 psi) for all
models.
Opening pressure is adjusted by
changing thickness of shim (5-Fig. 63).
A change in shim thickness of 0.1 mm
(0.004 inch) will change opening
pressure approximately 965 kPa (140
psi).
SEAT LEAKAGE. To check for
leakage, actuate tester lever slowly to
maintain a pressure 1000 kPa (150 psi)
below opening pressure. There should be
no accumulation of fuel at nozzle tip. A
slight wetting is allowed after 10
seconds if no drops are formed. If fuel
leakage is evident, injector must be
disassembled, cleaned and overhauled as
outlined in paragraph 53.
SPRAY PATTERN. Spray pattern
should be well atomized and uniform.
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