John Deere stx38 - Manual (Page 56)

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4/23/97
TESTS AND ADJUSTMENTS ENGINE
FUEL FLOW TEST
Reason:
To determine fuel availability to the carburetor.
Equipment:
• Proper Fuel Container
Connections:
1. Clamp fuel line (A) or turn off fuel shut-off valve, if
equipped, to prevent fuel flow.
2. Disconnect fuel line (B) from carburetor and place
in container.
Procedure:
1. Release clamp on fuel line (A) or turn on fuel shut-
off valve, if equipped. Fuel should flow freely into
container.
2. Clamp line or close valve to install line (B) on
carburetor.
3. Pore captured fuel into tank.
Results:
If fuel flow is slow, check the following:
• Replace fuel filter
• Check fuel lines, shut-off valve (if equipped), fuel
tank outlet, and fuel tank cap for restrictions
OIL PRESSURE TEST
Reason:
To verify if the engine has enough oil pressure to
lubricate internal components.
Test Equipment:
• Oil Pressure Test Kit JTO7262
• Fitting JTO5487
• Gauge JTO7034
• Coupler JTO3262
• Hose JTO3017
NOTE: Oil Pressure Test Kit AM122553 has been
replaced with SERVICEGARD Oil Pressure
Test Kit JTO7262. This kit includes an oil filter
adapter and O-ring only. The hose (JTO3017),
gauge (JTO7034), coupler (JTO3262), and
fitting (JTO5487) are found in other
SERVICEGARD test kits.
Procedure:
1. Park machine on level surface, turn key switch
OFF, and allow engine to cool.
2. Check engine oil level, bring level to full mark.
For Engines With No Oil Pressure Test Port:
3. Remove oil filter. (Plastic bag may be used to
protect paint and channel oil to drain pan).
4. Install pressure tester to oil filter flange.
5. Start engine and run until hot. (Be sure to maintain
full crankcase oil level during testing).
6. Check oil pressure when oil is both cold and hot,
and at both idle and full throttle.
For Engines With Oil Pressure Test Port:
1. Attach Oil Pressure Test Hose to engine by
removing plug on housing below oil filter.
2. Install test gauge on test hose.
3. Start engine and run until hot. (Be sure to maintain
full crankcase oil level during testing).
4. Check oil pressure when oil is both cold and hot,
and at both idle and full throttle.
Results:
• Oil pressure on a cold engine at start-up can reach
as high as 414 kPa (60 psi). (Pressure relief valve
will open beyond this pressure).
• Oil pressure at operating temperature (warm
engine at idle) may be as low as 124 kPa (18 psi).
M55938
A
B
c
CAUTION
Engine components are HOT. DO NOT touch
with bare skin, especially the exhaust pipe or
muffler while making test. Wear protective eye
glasses and clothing.
M85845
Drain Plug
Oil Filter