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Run the performance tests at 90 psig (6.2 bar/620 kPa) air pressure at the inlet of the tool with an eight foot
(2.44 m) legnth of 3/4" (19 mm) diameter air supply hose.
1. Without a wheel on the tool, operate the Grinder with the Throttle Lever fully depressed and check the free speed by
applying a hand–held techometer to the spindle end. The minimum and maximum allowable free speeds are as
follows:
Model
99H45
99H60
2. Test the Grinder Motor for power to determine these minimum performance levels. The Throttle Lever must not be
actuated repeatedly during the test. Depress the Lever and hold it in the open position until the test is complete.
Model
99H45
99H60
3. There must be no objectionable leaks in any non–exhaust area. The Throttle must not leak when it is closed.
4. There must be no leaks past the closed Throttle that will run the motor.
5. The Grinder must start smoothly when the Throttle Lever is depressed and must shut off completely when the Throttle
Lever is released.
6. The Grinder must be equipped with a spring–loaded window style Lock (17). The Lock must return to the locked
position when the Throttle Lever is released.
7. The tool must run smoothly without noticeable vibration or unusual sound.
DISCONNECT THE GRINDER FROM THE AIR SUPPLY HOSE AND SHUT OFF AIR TO THE TOOL
BEFORE PROCEEDING WITH THE TEST AND INSPECTION PROCEDURE.
8. The Arbor (58 or 59) must turn freely with no evidence of brinelled bearings.
9. The Threads on the arbor must be free of nicks and damage.
10. The Nameplate must be legible, in place and securely fastened. Make replacement if necessary.
MAINTENANCE SECTION
TEST AND INSPECTION PROCEDURE
Stamped
4500
6000
Torque
ft–lb
3.80
3.50
21
Free Speed
Minimum
4300
5650
Speed, rpm (r/min)
–at–
Nm
5.2
4.7
Maximum
4550
6050
3300
4400
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