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Disconnect the Grinder from the air supply hose or
shut off air to the tool before proceeding with the test
and inspection procedure.
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)
length 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 tachometer to the
spindle end. The minimum and maximum allowable
free speeds are as follows:
Model
Stamped
88V60
6 000
88V77
7 700
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.
MAINTENANCE SECTION
TEST AND INSPECTION PROCEDURE
Free Speed, rpm
Min
Max
5 650
6 050
7 250
7 750
20
Model
ft–lb
88V60
1.89
88V77
1.65
88V85
1.60
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 Lever Lock (15). The Lever 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.
8. The Arbor (27) must turn freely with no evidence of
brinnelled 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.
Torque
Speed rpm
Nm
2.6
5 000
2.2
6 000
2.2
6 500
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