HENRY TOOLS, INC. Ph: (216) 291-1011 or (800) 826-5257
General Operators Instructions and Service Manual
www.HenryTools.com | Page 109 Revised 02/19/12
For additional product information visit our website.
SERVICE INSTRUCTIONS
This tool is designed to operate on 90 psig (6.2 bar) maximum
air pressure with 1/4” (8 mm) hose. Do not use a grinder without
recommended wheel guard. Do not use any wheel for which the
operating speed listed is lower than the actual free speed of the
Grinder.
SAFETY
1. Before operation check spindle speed with a tachometer. If
the RPM exceeds the rated speed stamped on tool, servicing is
required. Inspect grinding wheels for bends, chips, nicks, cracks or
severe wear. If the wheel has any of these, or has been soaked in
liquids do not use. On brushes check for loose wires that may y
off in operation.
2. Start new grinding wheels under a steel bench. Run at full
throttle for one minute. Defective wheels usually come apart im-
mediately. When starting a cold wheel apply to work slowly, allow
wheel to warm gradually.
3. Model 49RAC grinders equipped with built in collets are
intended for mounted wheels,points and carbide burrs. They
are not guarded for type 1 wheels. If you have a type 1 wheel
application,please purchase a guard (4504,4505,etc.)
4. The Model 49RA Grinders are equipped with a guard from the
manufacturer. A guard is not needed for :a.) mounted wheels two
inches (50 mm) or smaller; b.) grinders used for internal work,
while within the work being ground. At leastone-half of the man-
drel length (i.e. mounted wheel, burr, etc.) must be inserted into
the collet. Secure collet chuck tightly.
5. Safety levers are available from the manufacturer. Before
mounting or removing a wheel, disconnect grinder from air supply.
The wheel should t properly on arbor, do not use bushings or
wheel anges to adapt a wheel to any arbor unless recommended
by the manufacturer. (Wheel anges should be at least 1/3 the
diameter of the grinding wheel.)
6. Wear safety goggles and other protective clothing. Continuous
exposure to vibration may cause injury to your hands and arms.
(See regulations.)
7. Properly maintained air tools are less likely to fail or cause
accidents. If tool produces an unusual sound or vibrations repair
immediately.
DISASSEMBLY
PLEASE NOTE: The brass spacers that were installed by the
factory are necessary for this tool to operate efciently.
When disassembling this tool examine how spacers are
arranged. They must be installed exactly the same way.
Failure to do this will cause improper gear spacing, which
causes pre-mature tool failure.
1. Disconnect air & remove all wheels and accessories. Remove
dead handle (404-40). Softly secure anglehead (404-1) in vise
on dead handle boss. Unscrew and remove case(49-1). Never
squeeze anglehead(404-1) in vise. This will distort bearings and
ruin gear alignment.
2. Pull motor from right angle head. Be careful to note loca-
tion of shims. Remove snap ring (404-39),wafer(404-38),O-
ring(594016), and snap ring (592016).(Some of these may not be
present).
3. Install brass or aluminum jaws in vise. Grasp the O.D. of
cylinder(49-2)and end plate(49-497). Using a 3/16” punch, tap
spindle out rear bearing (404-9). Try not to drop the assembly on
the oor.
4. Remove cylinder, blades(400-6).
5. With rotor (400-5) still on spindle (404-14), grasp the ro-
tor in vise snugly and remove pinion gear(405-10).
6. Remove rotor(400-5) Remove key and front thrust
plate(400-7). 9. Press bearing (400-G-11) off of spindle.
7. Secure angle head (404-1) SOFTLY in vise and unscrew
cap (404-2). Remove from vise and tap on spindle with a
plastic hammer The spindle assembly and spring washers
(404-6) will slide out.
8. Clamp ats of spindle(405-17) in vise. Using a plastic
hammer, tap evenly on O.D. of bearing cap until free of bear-
ing (404-3). Note position of shims. Using a 9/64” T-Handle
hex wrench unscrew (591028) screw.
9. Press bearing (404-3) off spindle. Support bearing (404-7)
and press spindle through with 1/4” punch. This will remove
gear (405-10) and bearing(404-7).
10. Remove key (404-4).
ASSEMBLY
1. Support front bearing(400-G-11) on drill block. Press
spindle (404-14) through bearing until it bottoms on shoulder.
2. Slide front thrust(400-7)over the spindle and onto front
bearing (400-G-11). Place key(400-10) into keyway in
spindle. Slide rotor down over shaft.
3. Grasp rotor in vise snugly and replace pinion gear(405-10)
and wrench rmly.
4. Support bearing and pinion gear in downward position.
Place ve blades(400-6) in slots. (curved side of blade faces
inward).
5. Slip cylinder(49-2) over rotor. Place a few drops of airtool
oil onto rotor (400-5). Install rear thrust(49-497) locating
cylinder pin in small hole of rear thrust plate. Place bear-
ing (404-9) in rear thrust and tap into place with a suitable
bearing driver. Using pliers place snap ring(592016) in spindle
groove.[(May be snap ring (404-39)]
6. Support bearing(404-7) on inner race. Press spindle (405-
17) through bearing until it bottoms on shoulder.
7. Install key (404-4) and line up with keyway of ring
gear(405-10). Support gear on inner diameter and press
spindle through.
8. Replace gear spacer ring (405-15) on spindle.
9. Support threaded end of spindle and press on bearing
(404-3). Tighten screw (591028) into end of spindle. Press
spindle assembly into cap (404-2). Apply some grease to
gear.
10. Install spring washer (404-6) into angle head(404-1). In-
stall spindle assembly into angle head housing, secure in vise
and tighten cap (404-2).
11. Re-Locate angle head in vise-so that the motor can be
installed vertically.
12. Replace shim(404-20) exactly as it was originally installed.
Jiggle greased pinion assembly into angle head (404-1) while
turning spindle (405-17) so that gears mesh. Tap lightly on
rear of motor to insure that is fully seated.
13. Slide case (49-1) over motor assembly and tighten. Place
a few drops of oil into air inlet.
14. Replace guard on tool.
15. CHECK RPM WITH TACHOMETER.TOOL MUST RUN AT
OR BELOW SPEED THAT IS STAMPED ON TOOL.
MODELS
49 RA
49 RAZ
49 RAC
REAR EXHAUST RIGHT ANGLE GRINDER
