Honda WT30XK4, Руководство пользователя

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PUMP
10-7
PUMP VACUUM TEST
TEST
Fill the pump housing with water.
Position garden hose (1) in the discharge port turn the
hose on so a steady stream of water flows out the port.
This will ensure the pump housing remains completely
full during the test.
Start the engine, position the throttle lever in the fast
position and allow the engine to warm up for several
minutes.
Adjust the maximum engine rpm to the proper no-load
specification (page 7-4).
Position the vacuum gauge (2) against the suction port
to obtain the vacuum reading.
Vacuum reading will decrease by approximately 1 in Hg
per 1000 ft increase in elevation.
Shut off the engine and confirm the vacuum gauge
reading remains steady. This verifies the intake flapper
is sealing.
RESULTS
1. If the vacuum gauge won't remain steady after
shutting off the engine, disassemble and inspect the
flapper for wear or damage.
2. A vacuum reading below 22 inches of mercury (at
sea level) indicates a problem with the pump. If the
vacuum is low, refer to the shop manual to
disassemble the pump and inspect the:
• Impeller and volute for damage or wear. Check the
impeller/volute clearance.
• Mechanical seal for damage.
• Pump case housing and O-rings for damage or
leaks.
3. If the customer complains that the pump won't
prime, but the vacuum reading is good, the customer
likely has an air leak in the suction hose or fittings, or
the suction head is too high.
MINIMUM VACUUM:
22 in Hg (all models, at sea level)
(1)
(2)
61YG1000.book 7 ページ ２０１２年２月２０日 月曜日 午後２時４３分