Nozzle Tests (Fig. 18, 19)
There are several tests to examine the condition of the
injection nozzles. These tests require the use of a
nozzle tester and nozzle tester adapter. (See the Spe•
cial Tools section of this chapter.)
3. Allow pressure to dissipate before performing the test.
4. Operate the pump handle slowly and observe the
gauge to determine the pressure at which the nozzle
opens and the fuel is sprayed.
5.
Verify that starting pressure is within the following
limits:
The nozzle tester forces fuel from the nozzle
under extremely high pressure. Always point
the nozzle tip away from yourself and any
other personnel. Contact with the fuel stream,
even though it appears to be a mist can cause
fuel to penetrate clothing and skin. If fuel is
injected into the skin get proper medical at•
tention from a doctor immediately. A serious
infection or other reaction can develop if the
injury is not properly treated. Tighten all
adapter fittings to prevent leaks. If a leak is
suspected, use a piece of cardboard, not your
hands to search for a leak.
Minimum starting pressure
120 kg/cm2 (1700 psi)
130 kg/cm2 (1850 psi)
Maximum starting pressure
6. Starting pressure can be adjusted by adding or re•
moving shims from the nozzle. (See Nozzle Service in
the Fuel System Repairs section of this chapter.) A
0.1 mm shim will cause a 10 kg/cm
pressure difference.
2
(140 psi) starting
7. Repeat the test after installing shim to verify that a
correct starting pressure has been obtained.
Chattering Test
Proper and free operation of the nozzle valve can be
determined by the chattering test.
1. Securely fasten the nozzle to be tested to the adapter.
To prevent possible injury, wear eye protec•
tion when operating the nozzle tester.
2.
Operate the pump handle slowly (ten strokes per
minute). As the pump pressure reaches the starting
pressure the nozzle valve will chatter as it opens and
closes rapidly. A nozzle which does not chatter may be
the result of a binding or bent nozzle valve.
IMPORTANT: Always use fresh filtered fuel in the
nozzle tester. Use of dirty fuel can damage the
precision parts of the injector nozzle. It is a good
practice to:
Nozzle Leakage Test
1. Bolt the tester securely to the test bench.
2. Use a drain pan to catch fuel.
A nozzle that leaks fuel from the nozzle orifice must be
replaced.
1. Securely fasten the nozzle to the adapter.
2. Wipe all fuel from the nozzle.
3. Flush the adapter by pumping the handle of the tester
slowly several times before attaching the nozzle to be
tested.
3. Operate the pump until the pressure is approximately
Injection Pressure Test
2
108
kg/cm (1500 psi). Maintain this pressure to the
nozzle.
The diesel engine requires that fuel be sprayed into the
combustion chamber at a precise point in the compres•
sion stroke. The point at which this fuel injection occurs
is determined by the injection timing. If the nozzle is
defective, damaged or adjusted incorrectly, starting fail•
ures, low power output, or engine knocking can occur.
4.
Watch for leaks where the threaded nozzle body
threads into the retaining nut. Leaks in this area would
indicate a bad seat between the distance piece and/or
the body or nozzle assembly.
5. If
tened in the retaining nut. If the leak continues, replace
the nozzle.
leakage occurs, verify that the body is tightly fas•
1. Securely fasten the nozzle to the adapter.
2. Pump the handle several times to purge air from the
nozzle mechanism.
Testing
Page 4 - 20
Groundsmaster® 300 Series
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
|---|---|
| Tags | Toro Groundsmaster 300, Toro Groundsmaster 328 D, Toro Groundsmaster 92801SL |
| Download File |
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| Document Type | Service Manual |
| Language | English |
| Product Brand | Toro. Customer Service Representatives are available by phone:
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| Wikipedia's Page | Toro Company |
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(2 votes, average: 5 out of 5)
Lawn and Garden readers have rated Toro 92801SL Rev I Groundsmaster 300 Series Groundsmaster 328 D Service Manual 5.0 out of 5.0 based on 2 product reviews. Need 328D. Manual pdf. Will rate after finding manual
t has been a very reliable machine but getting parts is hard and not cheap to buy , generic parts has been cost effective and reliable , i am unable to get a wiring circut diagram for this unit as most problems are electrical problems