Thread: John Deere SST
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  #26  
Old 07-12-2008, 06:30 AM
ccecilm ccecilm is offline
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Join Date: Apr 2006
Location: Clinton, OK
Posts: 42
Great! At least one problem is solved. Bypassing the OEM vacuum line is a good idea (and inexpensive). If you need to measure vacuum run engine at medium idle for 3 - 5 minutes to bring engine to normal operating temperature. Vacuum at engine should be 13 inches. Here is the whole shabang from the tech manual:

1. Run engine at medium idle for 3 - 5 minutes to bring
engine to normal operating temperature.

2. Park machine safely with park brake locked. See “Park
Machine Safely” on page 3.

3. Raise hood.

4. Disconnect vacuum line (A) and install tee fitting into the
line.

5. Connect the vacuum gauge the third connector of the
tee fitting.

• If vacuum is 33 cm (13 in.) of mercury movement or
greater, vacuum supply from engine is ok. If a steering problem remains, check vacuum f ilters, and solenoids at actuators.
• If vacuum is less than 33 cm (13 in.) of mercury
movement, retest vacuum using straight fitting connected
directly from the engine to the vacuum gauge.
• If vacuum is 33 cm (13 in.) of water movement or
greater, vacuum supply from engine is ok. If a steering
problem remains, check vacuum filters, and solenoids at
actuators.
• If vacuum supply from engine is ok, remove fender
deck and test for vacuum at the tee fitting (G) near the
actuators. Disconnect one actuator hose and test for
vacuum.
• If the vacuum is within specification, the lines are
good.
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