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TM 5-2420-222-34
3-2.
ENGINE ASSEMBLY VACUUM TEST (Con’t).
5.
Increase engine speed to 2500 rpm. Apply full load by setting parking brake and placing transmission gearshift in
forward position, lock brakes, and release clutch pedal to engage clutch (see TM5-2420-222-10). lever in low range.
Place transmission gearshift lever in first gear, speed gear assembly (reverser) control lever
6.
Record U-tube manometer and air cleaner restriction indicator (1) readings. Maximum allowable vacuum is 25 in.
(63.50 cm) of water. If air cleaner restriction indicator and U-tube manometer did not agree at first reading in step 4 or
second reading in this step, replace air cleaner restriction indicator (see TM5-2420-222-20).
7.
Shut down engine assembly (see TM5-2420-222-10).
8.
Disconnect U-tube manometer, air cleaner restriction indicator (1), and tee from air cleaner (2).
9.
Install air cleaner restriction indicator (1) on air cleaner (2) (see TM5-2420-222-20).
TA701221
3-6
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