Jarvis MCS 300 User manual

TABLE OF
CONTENTS Page............................
Model MCS 300
9 inch Blade 4001044..................
9 inch Blade with Depth Gage 4001050..
9 inch Blade Dual Triggers 115V 4001066
10.5 inch Blade 4001042..............
10.5 in. Blade Dual Triggers 115V 4001067
10.5 in. Blade Dual Triggers 220V 4001070
12 inch Blade 4001045................
12 inch Blade Dual Triggers 115V 4001065
Balancer 4042040......................
Air Filter/Regulator/Lubricator 3022003....
Air Supply Hose Assembly 1059015......
Model MCS 300
Air Circular Saw
EQUIPMENT
SELECTION Ordering No...........
•Notice to Employer and Safety
Director 2...........................
•Notice to Operators, Maintenance
and Cleanup Personnel 3..............
•Parts Diagram and List 4..............
•Special Tools 8.......................
•Specifications 9......................
•Installation Instructions 9..............
•Operation Instructions 9...............
•Maintenance Instructions 10...........
®
JARVIS
6201010:.
PRODUCTS CORPORATION
33 ANDERSON ROAD, MIDDLETOWN, CONNECTICUT 06457--4926
UNITED STATES OF AMERICA E--MAIL. [email protected]
TEL. [phone] FAX. [phone] WWW. jarvisproducts.com

noticetoemployer
and safety director
Model MCS 300 page 2 of 16
®
JARVIS
6201010:.
PRODUCTS CORPORATION
33 ANDERSON ROAD, MIDDLETOWN, CONNECTICUT 06457--4926
UNITED STATES OF AMERICA E--MAIL. [email protected]
TEL. [phone] FAX. [phone] WWW. jarvisproducts.com
1 Remove and repair any tool that malfunctions. All personnel must be instructed to remove any
malfunctioning equipment.
2 Ensure that all employees who use this tool are trained in the proper use of this tool and are aware
of the dangers that may arise if they do not follow the procedures outlined in this brochure.
3Enclosedare four (4) copies of “NOTICE TO OPERATORS, MAINTENANCE AND CLEANUP
PERSONNEL.” Post one copy on the employees’ bulletin board; give one copy to operator(s); give
one copy to the maintenance foreman; and give one copy to the sub-contract cleanup / internal cleanup
foreman. Additional copies will be provided upon request.
4The tool is designed and intended to be powerful. This fact should be obvious to your employees,
but you must emphasize it to them.
5 Never make modifications or alterations to the tool. Replace any missing or illegible labels.
6 Ensure that proper procedures are established in accordance with OSHA’s lockout/tagout procedures
(29 CFR 1910.147) to prevent accidental startup or release of stored energy.
7 Hand/Wrist/Arm injury and other Cumulative Trauma Disorders may result from repetitive work,
motion or vibration. You must make your employees aware of hazards, symptoms of injury and ap-
propriate prevention. See OSHA’s “Ergonomics Program Management Guidelines for Meatpacking
Plants.”
8 Follow our installation and maintenance instructions for proper installation and care of the tool.
9 Ensure that employees wear eye protection in accordance with OSHA’s eye and face protection re-
quirements (29 CFR 1910.133) when operating the tool.
10 Avoid injury. Do not permit the tool to be misused.
11 If you resell or distribute a Jarvis product, you must provide the purchaser with the appropriate safety
sheets and tool brochure. Additional copies of safety sheets and tool brochures will be provided upon
request.
NOTICE TO EMPLOYER AND SAFETY DIRECTOR
AVOID INJURY
Keep hands clear.

notice to operators, maintenance
and cleanup personnel
Model MCS 300
page 3 of 16
®
JARVIS
6201010:.
PRODUCTS CORPORATION
33 ANDERSON ROAD, MIDDLETOWN, CONNECTICUT 06457--4926
UNITED STATES OF AMERICA E--MAIL. [email protected]
TEL. [phone] FAX. [phone] WWW. jarvisproducts.com
1Disconnect the air hose in accordance with OSHA’s lockout/tagout procedures (29 CFR 1910.147)
before making any blade changes.
2Disconnect the air hose in accordance with OSHA’s lockout/tagout procedures (29 CFR 1910.147)
before performing any repairs or maintenance.
3Disconnect the air hose -- or have the air hose disconnected -- in accordance with OSHA’s lockout/tag-
out procedures (29 CFR 1910.147) before performing any cleanup.
4Disconnect the air hose when the tool is not in use.
5Never put fingers, hands or other parts of the body on the cutting edge or within the cutting path of
the tool when it is connected to an air supply.
6Test the tool prior to use or daily. For single trigger tools: Depress the trigger and the tool should
start; release the trigger and the tool should stop. For dual trigger tools: Depress one trigger, then
pause one second and depress the other trigger and the tool should not start. Repeat this procedure
reversing the triggers. Depress both triggers simultaneously and the tool should start. With the tool
running, release one trigger and the tool should stop. Continue holding the depressed trigger and then
depress the other trigger. The tool should not start. Repeat this procedure holding the other trigger.
If the tool malfunctions, remove it from service and report or repair it immediately.
7Never depress the trigger unless you want to use or test the tool.
8Never make modifications or alterations to the tool. Replace any missing or illegible labels.
9Always wear eye protection in accordance with OSHA’s eye and face protection requirements (29
CFR 1910.133) when using the tool.
10 Always use both hands when starting and operating the tool to avoid the risk of possible “kick back”
or “recoil.” Continue holding the tool with both hands until the saw blade comes to a complete stop.
NOTICE TO OPERATORS, MAINTENANCE AND CLEANUP PERSONNEL
REMOVE ANY MALFUNCTIONING TOOL FROM SERVICE
REPORT ANY PROBLEMS TO YOUR SUPERVISOR
Keep hands clear.

parts diagram and list
Model MCS 300 page 4 of 16
®
JARVIS
6201010:.
PRODUCTS CORPORATION
33 ANDERSON ROAD, MIDDLETOWN, CONNECTICUT 06457--4926
UNITED STATES OF AMERICA E--MAIL. [email protected]
TEL. [phone] FAX. [phone] WWW. jarvisproducts.com
1 1018128DLocking Lever 1
2 1054134DDepth Gage Screw 1
3 1032359DDepth Gage Plate 1
4 1007341YBlade Nut 1
5 1023102 Blade, 9 inch 1
1023111 Blade, 10.5 inch, 84 teeth
1023112 Blade, 12 inch
1023575 Blade, 180 mm
6 1024217 Blade Guard, 9 inch 1
1024218 Blade Guard, 10.5 inch
1024219 Blade Guard, 12 inch
1024290 Blade Guard, 180 mm
7 1004314 External Tooth Washer 1
8 1055802* Hex Head Screw, 20 mm lg. 1
1055610 Hex Head Screw, 25 mm lg. 1
9 1019200 Auxiliary Handle 1
10 1010460 Dowel Pin 2
11 1035451 O--ring 1
12 1035565 U--cup Seal 1
13 1026205 Spur Gear (36 Tooth) 1
14 1010463 Spur Gear Pin 1
15 1021155 Ball Bearing 2
16 1013232 Retaining Ring 2
17 1035210 O--ring 2
18 1016560 Spur Gear Hsg, Roller Brgs 1
1016634 Spur Gear Hsg, Ball Brgs
19 1038027 Grease Fitting 2
20 1007343 Spur Gear Hex Nut, LH Thd. 1
21 1007342* Crown Gear Hex Nut 1
22 1004411 Flanged Washer 1
23 1007380 Crown Gear Hex Nut 2
24 1035005 O--ring 1
25 1013275 Spiral Retaining Ring 1
26 1036264 Hanger Bushing 1
27 1042415 Hanger 1
28 1021352 Needle Bearing 1
ITEM PART NO. PART NAME QTY
29 1004231 Lock Washer 2
30 1055613 Hex Head Screw 1
31 1055067 Socket Head Cap Screw 4
32 1030074 Key 1
33 1021415 Ball Bearing (Double Row) 1
34 1013273 Retaining Ring 1
35 1031030 Planetary Gear Hub 1
36 1004362 Pinion Gear Washer 1
37 1055852 Flat Head Socket Screw 1
38 1013276 Retaining Ring 3
39 1026204 Planet Gear 3
40 1021414GNeedle Bearing 3
41 1010462 Planetary Gear Pin 3
42 1009127 Needle Bearing Inner Race 1
43 1026208 Pinion Gear 1
44 1026209 Planetary Ring Gear 1
45 1016563 Planetary Housing 1
46 3069002* Shim Package 1
47 1021278* Tapered Bearing Cone 2
48 1021413*GTapered Bearing Cup 2
49 1026207* Crown Gear 1
50 1026206 Spur Gear (37 Tooth) 1
51 1030075 Key 2
52 1013274 Retaining Ring 1
53 1029355* Bearing Spacer 1
54 1010461* Crown Gear Pin 1
55 1055058 Flat Head Slotted Screw 6
56 1010509 Crown Gear Pin 1
57 1026243 Crown Gear 1
58 1029415 Flanged Spacer 1
3016507 Gear Hsg Assy, Ball Brgs
(incls items 11--20, 22, 23, 28,
32, 33, 42, 43 and 56--58)
3016508* Gear Hsg Assy, Roller Brgs
(incls items 11--21, 28, 32, 33,
42, 43 and 46--54)
ITEM PART NO. PART NAME QTY
Figure A
Y
YAJarvis special tool is available for disassembly and
assembly. See Figure E on page 8 for part number.
GAJarvis special tool is available for disassembly.
See Figure E on page 6 for part number.
* Not used in current tools
** Shim package contains 5 shims 0.1 mm thick and 5
shims 0.2 mm thick. Install only as many shims as
necessary to obtain proper fit.
DUsed in 4001050 only
D
D
D
*
G
*
**
*

parts diagram and list
Model MCS 300
page 5 of 16
®
JARVIS
6201010:.
PRODUCTS CORPORATION
33 ANDERSON ROAD, MIDDLETOWN, CONNECTICUT 06457--4926
UNITED STATES OF AMERICA E--MAIL. [email protected]
TEL. [phone] FAX. [phone] WWW. jarvisproducts.com
59 1035501 O--ring 1
60 1016561 Motor Housing (incl. item 61) 1
61 1017083 Danger Label 1
62 1021306 Ball Bearing 2
63 1014173 Wave Spring 1
64 1032530 Front Motor Plate 1
65 1064069 Rotor, 4 Vanes
1064044* Rotor, 5 Vanes 1
66 1040018 Vane for 4 Vane Rotor
1040017* Vane for 5 Vane Rotor 5
67 1029354 Rotor Spacer 2
68 1009157 Air Motor Sleeve 1
69 1054170 Rotor Screw 1
70 1035568 O--ring 1
71 1010373 Dowel Pin 1
72 1036261 Bushing 1
73 1018154 Trigger with items 71 and 72 1
74 1019201 Handle and Valve Housing 1
(includes items 94)
75 1012110 Hose Clamp 2
76 1004230 Lock Washer 4
77 1055059 Cheese Head Screw 4
78 1051025 Quick Connect Plug 1
79 1051029 Quick Connect Socket 1
80 1059015 Hose Assy (includes item 79) 1
81 1051179 Muffler 1
82 1061802 Tubing 3 ft
83 1017400 Name Plate and Info Label 1
84 1055274 Drive Screw 4
85 1054169 Valve Plug 1
86 1035162 O--ring 1
87 1014172 Compression Spring 1
88 1054178 Valve Screw & Spring Guide 1
89 1035244 O--ring 1
90 1016576 Seal Housing 1
91 1035575 Valve Seal 1
92 1013277 External Retaining Ring 1
93 1039069 Valve Plunger 1
ITEM PART NO. PART NAME QTY
Figure B
94 1036262 Bushing 2
95 1051180 Exhaust Pipe Fitting 1
96 1010355 Threaded Pin 1
97 1035287 O--ring 1
98 1032531 Rear Motor Plate 1
99 1010459 Dowel Pin 2
3016393 Motor Assembly (includes
items 62--69, 98 and 99)
3019222 Handle Assembly (includes
items 71--74 and 83--96)
3022085 Valve Plunger Assembly
(includes items 88--93)
ITEM PART NO. PART NAME QTY
* not used in current tools
*
*

parts diagram and list
Model MCS 300 page 6 of 16
®
JARVIS
6201010:.
PRODUCTS CORPORATION
33 ANDERSON ROAD, MIDDLETOWN, CONNECTICUT 06457--4926
UNITED STATES OF AMERICA E--MAIL. [email protected]
TEL. [phone] FAX. [phone] WWW. jarvisproducts.com
100 1051083 Connector Elbow 2
101 1019253 Front Handle 1
102 1010235 Dowel Pin 1
103 1022211 Valve 2
104 1054153 Threaded Plug 2
105 1018020 Front Trigger Lever 1
106 1024035 Trigger Guard 1
107 1055134 Locking Screw 2
108 1018171 Rear Trigger Lever 1
109 1019255 Rear Handle 1
110 1051321 Tubing Connector 1
111 1051119 Tubing Connector 2
112 1051313 “Y” Connector 1
113 1061570 Tubing, Yellow 2 ft 2
114 1061670 Tubing, Blue 2 ft 2
115 1051124 Tubing Connector 2
116 1050268 Elbow 2
117 1012033 Trigger Guard Clamp 1
118 1012056 Loop Clamp 1
3019304 Front Handle Assy (includes
items 7, 8, 100--107, 112--114
and 117)
3019309 Rear Handle Assy (includes
items 71, 72, 96, 103, 104,
108--110, 115 and 116)
ITEM PART NO. PART NAME QTY
Figure C
Dual Trigger
Handles

parts diagram
Model MCS 300
page 7 of 16
®
JARVIS
6201010:.
PRODUCTS CORPORATION
33 ANDERSON ROAD, MIDDLETOWN, CONNECTICUT 06457--4926
UNITED STATES OF AMERICA E--MAIL. [email protected]
TEL. [phone] FAX. [phone] WWW. jarvisproducts.com
Figure D
ATD Control Box
3063346 220V
3063348 115V

parts list and
special tools
Model MCS 300 page 8 of 16
®
JARVIS
6201010:.
PRODUCTS CORPORATION
33 ANDERSON ROAD, MIDDLETOWN, CONNECTICUT 06457--4926
UNITED STATES OF AMERICA E--MAIL. [email protected]
TEL. [phone] FAX. [phone] WWW. jarvisproducts.com
1 1055352 Socket Head Cap Screw 2
2 1004001 Washer 2
3 1051321 Tubing Connector 1
4 1071372 Plastic Tubing, 24 ft 1
5 1005059 Switch 2
6 1061670 Blue Tubing, 2 ft 1
7 1051091 Tubing Connector 2
8 1061255 Yellow Tubing, 20 ft 2
9 1051065 Pneumatic Actuator 2
10 1004154 Washer 2
11 1063862 Glass Fuse, 220v 1
1063612* Pigtail Fuse, 220v
1072091 Glass Fuse, 115v 1
1063311* Pigtail Fuse, 115v
12 1051063 Tee 2
13 1051069 Air Bleed Fitting 2
14 1072072 ATD Circuit Board, 220v 1
1072071 ATD Circuit Board, 115v
15 1029445 Hex Spacer 4
16 1004244 Internal Lock Washer 4
17 1073072 Plastic Screw 4
18 1034014 Air Filter 1
19 1051169 Connector Elbow 2
20 1061347 Black Tubing, 20 ft 1
21 1051316 Connector Elbow 1
22 1025049 Pressure Gage 1
ITEM PART NO. PART NAME QTY
23 1022066 Pressure Regulator 1
24 1051059 Nipple 1
25 1055197 Socket Head Cap Screw 2
26 1004206 Washer 2
27 1007355 Lock Nut 2
28 1017012 Warning Label 1
29 1017391 Wiring Diagram Label, 220v 1
1017422 Wiring Diagram Label, 115v
30 1016347 Electrical Enclosure 1
31 1032266 Mounting Plate, ATD Board 1
32 1063238 Hole Plug 1
33 1007278 Locking Nut 2
34 1004211 Sealing Ring 2
35 1063502 Wire Terminal Fork 13
36 1011246 Cord Strain Relief Elbow 1
37 1011240 Cord Strain Relief 1
38 1001089 Electric Cord, 3 ft 1
39 1063079 Wire Terminal Ring 1
40 1055843 Fillister Head Screw 4
41 1072136 Din Connector, 220v 1
1072135 Din Connector, 115v
42 1032681 Mounting Plate, Control 1
43 1050015 Reducer Bushing 1
44 1022332 Valve, Three Way, 115v 1
1022336 Valve, Three Way, 220v
45 1051179 Air Exhaust Muffler 1
46 1050862 Tee, Air Inlet 1
ITEM PART NO. PART NAME QTY
* not used in current tools
Figure E
Special Tools
THE FOLLOWING TOOLS ARE RECOMMENDED FOR
PROPER AND EFFECTIVE DISASSEMBLY AND AS-
SEMBLY OF THE JARVIS MCS 300 AIR CIRCULAR
SAW.
NEEDLE BEARING
EXTRACTOR 8039168
BEARING CUP EXTRACTOR
8039167
WRENCH 1061361
Parts for ATD Control Box

specifications, installation
and operation instructions
Model MCS 300
page 9 of 16
®
JARVIS
6201010:.
PRODUCTS CORPORATION
33 ANDERSON ROAD, MIDDLETOWN, CONNECTICUT 06457--4926
UNITED STATES OF AMERICA E--MAIL. [email protected]
TEL. [phone] FAX. [phone] WWW. jarvisproducts.com
SPECIFICATIONS
Motor Power 2 hp 1500 W
Operating Pressure 90 psi 6.2 bar
Air Consumption at 90 psi 67 ft3/min 1.9 m3/min
Blade Speed 1150 rpm
Control Handle Single or Dual Trigger Pneumatic
Blade Diameter 9.0 in 229 mm
10.5 in 267 mm
12 in 305 mm
Cutting Depth (max)
9inchblade 3in 76mm
10.5 inch blade 3.4 in 86 mm
12 inch blade 4.38 in 111 mm
Overall Length
9 inch blade 22.7 in 577 mm
10.5 inch blade 23.2 in 589 mm
12 inch blade 24.2 in 615 mm
Weight 15.5 lbs 7.0 kg
Vibration less than (<) 125 dB < 1.78 m/sec2
Noise (one meter from tool) 91 dB
INSTALLATION INSTRUCTIONS
1 Suspend the MCS 300 from a balancer. Jarvis part
number 4042040 is available.
2 Make the necessary air connection.
2.1 The required compressed air supply is 67
ft3/min at 90 psi (1.9 m3/min at 6.2 bar).
2.2 Refer to Figure B on page 5 for single trigger
tools.
2.3 Refer to Figure C on page 6 for dual trigger
tools.
OPERATION INSTRUCTIONS
1Each day, before you begin operation, go through
the following checklist:
1.1 Make sure that the compressed air supply is at
the correct pressure and that the lubricator is up
to the full mark. Use Jarvis Air Mist Lubricator
Oil; if using a conventional air mist lubricator
set the feed rate at 8--10 drops per minute; if us-
ing a micro fog air mist lubricator set the feed
rate at 100 drops per minute. Note: Almost all
air mist lubricators are of the micro fog type.
1.2 Make sure that the saw moves freely on the ba-
lancer.
1.3 Make sure that the saw is working correctly.
For Single Trigger Tools: Depress the trigger
and the tool should start. Release the trigger and
the tool should stop. If the tool malfunctions, re-
move it from service and report the problem to
your supervisor immediately.
Always use two hands when starting and stop-
ping the tool. Continue holding the saw firmly
with both hands until the blade comes to a com-
plete stop.
For Dual Trigger Tools: Make sure the dual
anti--tie down control handles are working cor-
rectly. Depress each trigger separately and the
tool should not start. Depress one trigger, then
pause one second and depress the other trigger
and the tool should not start. Repeat this proce-
dure reversing the triggers. Depress both trig-
gers simultaneously (within one half second of
each other) and the tool should start. With the
tool running, release one trigger and the tool
should stop. Continue holding the depressed
trigger and then depress the other trigger. The
tool should not start. Repeat this procedure
holding the other trigger. If the tool malfunc-
tions, remove it from service and report the
problem to your supervisor immediately.
Always use two hands when starting and stop-
ping the tool. Continue holding the saw firmly
with both hands until the blade comes to a com-
plete stop.
2 Making the cut:
2.1 Position the saw.
2.2 Depress the trigger(s) fully to start the saw and
make the cut. Always use two hands when start-
ing the saw and while making the cut.
2.3 When the desired cut is reached, release the trig-
ger(s). Continue holding the saw firmly with
both hands until the blade comes to a com-
plete stop.
2.4 Withdraw the saw from the carcass.

maintenance instructions
Model MCS 300 page 10 of 16
®
JARVIS
6201010:.
PRODUCTS CORPORATION
33 ANDERSON ROAD, MIDDLETOWN, CONNECTICUT 06457--4926
UNITED STATES OF AMERICA E--MAIL. [email protected]
TEL. [phone] FAX. [phone] WWW. jarvisproducts.com
MAINTENANCE INSTRUCTIONS
IMPORTANT: ALWAYS DISCONNECT THE COM-
PRESSED AIR SUPPLY IN ACCORDANCE WITH
OSHA’S LOCKOUT/TAGOUT PROCEDURES (29 CFR
1910.147) WHEN INSTALLING OR REMOVING THE
BLADE. ALWAYS DISCONNECT THE AIR SUPPLY IN
ACCORDANCE WITH OSHA’S LOCKOUT/TAGOUT
PROCEDURES (29 CFR 1920.147) BEFORE PERFORM-
ING ANY MAINTENANCE OR REPAIRS.
Refer to Figures A--C on pages 4--6 for referenced items.
1 DAILY:
1.1 Add Jarvis 1315 White Grease to the grease fit-
tings (item 19) on the spur gear housing and
planetary housing (items 18 and 45).
1.2 Inspect all hoses for cuts and abrasions and re-
place as necessary.
1.3 Check all fittings and connections for leaks and
tighten or replace as necessary.
1.4 An air filter/regulator/lubricator (Jarvis part
number 3022003) must be installed in the air
supply line. Keep the lubricator filled at all
times.
1.5 Make sure that the saw is working correctly.
Note: The air supply must be connected to per-
form this maintenance check only.
For single trigger tools: Depress the trigger
and the tool should start. Release the trigger and
the tool should stop. If the tool malfunctions, re-
pair or remove it from service immediately.
Always use two hands when starting and stop-
ping the tool. Continue holding the saw firmly
with both hands until the blade comes to a com-
plete stop.
For Dual Trigger Tools: Make sure the dual
anti--tie down control handles are working cor-
rectly. Depress each trigger separately and the
tool should not start. Depress one trigger, then
pause one second and depress the other trigger
and the tool should not start. Repeat this proce-
dure reversing the triggers. Depress both trig-
gers simultaneously (within one half second of
each other) and the tool should start. With the
tool running, release one trigger and the tool
should stop. Continue holding the depressed
trigger and then depress the other trigger. The
tool should not start. Repeat this procedure
holding the other trigger. If the tool malfunc-
tions, remove it from service and report the
problem to your supervisor immediately.
Always use two hands when starting and stop-
ping the tool. Continue holding the saw firmly
with both hands until the blade comes to a com-
plete stop.
1.6 At the end of the shift/day, flush the air motor.
For Single Trigger Tools:
1.6.1 Remove quick connect socket (item 79)
from the quick connect plug (item 78) lo-
cated on the MCS 300.
1.6.2 Put about ten (10) drops of Jarvis Air Mist
Lubricator Oil into the quick connect plug
(item 78). Connect quick connect socket
(item 79) and run the motor one minute.
For Dual Trigger Tools:
1.6.3 Remove tubing 1071372 from tubing con-
nector (item 110).
1.6.4 Put about ten (10) drops of Jarvis Air Mist
Lubricator Oil into the tubing connector
(item 110). Insert tubing 1071372 into con-
nector and run the motor one minute.
2 WEEKLY:
2.1 Remove the planetary gear head assembly
(items 35--41) from planetary housing (item 45).
Refer to sections 8 and 9 as a procedural guide.
2.2 Apply Jarvis 1315 White Grease to the hole on
the end of planetary gear pins (item 41) to lubri-
cate needle bearings (item 40).
Note: Planetary gear assembly (items 35--41)
does not need to be disassembled to lubricate
needle bearings and planet gears. See Figure 1.
2.3 Apply a generous amount of Jarvis 1315 White
Grease to planet gears (item 39).

maintenance instructions
Model MCS 300
page 11 of 16
®
JARVIS
6201010:.
PRODUCTS CORPORATION
33 ANDERSON ROAD, MIDDLETOWN, CONNECTICUT 06457--4926
UNITED STATES OF AMERICA E--MAIL. [email protected]
TEL. [phone] FAX. [phone] WWW. jarvisproducts.com
Figure 1
Bearing and Gear Lubrication
PLANET GEAR
HOLE TO
LUBRICATE
NEEDLE BEARING
DOWEL PIN
RETAINING
RING
PLANETARY
HUB
3 AS NECESSARY:
3.1 Clean and inspect circular blade. Refer to sec-
tions 4 and 5 for blade removal and installation
procedures.
3.2 Disassemble, clean and inspect the spur gear
housing assembly, planetary housing assembly,
air motor assembly, and handle and valve hous-
ing assembly. Refer to sections 6 through 12 as
a procedural guide.
4 CIRCULAR BLADE REMOVAL:
4.1 Remove locking lever (item 1), depth gage
screw (item 2) and depth gage plate (item 3) if
applicable.
4.2 Remove the blade nut (item 4). Jarvis wrench
1061361 is available. See Figure E on page 8.
4.2.1 Place an awl or small screwdriver through
the outer hole in blade to prevent it from ro-
tating.
4.3 Remove the saw blade (item 5) and sharpen or
replace as necessary.
5 CIRCULAR BLADE INSTALLATION:
5.1 Reverse procedures and steps outlined in section
4. See notes below. Refer to Figure 2 as a guide.
5.1.1 To ensure proper fit and safe operation, the
hub of the saw blade (item 5) must face to-
ward and fit securely on the extended lip of
the spur gear.
5.1.2 Make sure notched areas on the saw blade
are aligned with ears on the spur gear.
LIP
BLADE
BLADE
NUT
SPUR
GEAR
EAR
OUTER
HOLE
HUB ON
OTHER
SIDE
NOTCHED
AREA
Figure 2
Blade Installation
BLADE
ROTATION
DIRECTION
5.1.3 When tightening blade nut (item 4), insert
an awl or small screwdriver through the out-
er hole in the blade to prevent blade from
turning. Jarvis wrench 1061361 is avail-
able. See Figure E on page 8.
6 SPUR GEAR HOUSING DISASSEMBLY:
6.1 Remove blade as described in section 4.
6.2 Remove flat head screws (item 55).
6.3 Remove blade guard assembly and auxiliary
handle assembly (items 6--9) as a complete unit
from spur gear housing (item 18).
6.4 Remove dowel pins, o--ring and u--cup seal
(items 10--12) from blade guard only if neces-
sary.
6.5 Remove cheese head screws (item 77) and lock
washers (item 76). Remove spur gear housing
(item 18) and planetary housing (item 45) as a
complete unit from motor housing (item 60).
6.5.1 Set motor housing and rear handle assembly
aside.
6.6 Remove hex head screws (item 30) and lock
washers (item 29). Separate planetary housing
assembly (items 24--45) as a complete unit from
spur gear housing (item 18).
6.7 Remove spur gear hex nut (item 20), left hand
thread.
6.7.1 Use a 5 mm allen wrench to hold spur gear
pin (item 14) from moving while unscrew-
ing spur gear hex nut (item 20), left hand
thread. Note: Use heat to loosen hex nut if
necessary.

maintenance instructions
Model MCS 300 page 12 of 16
®
JARVIS
6201010:.
PRODUCTS CORPORATION
33 ANDERSON ROAD, MIDDLETOWN, CONNECTICUT 06457--4926
UNITED STATES OF AMERICA E--MAIL. [email protected]
TEL. [phone] FAX. [phone] WWW. jarvisproducts.com
6.8 Remove entire spur gear assembly (items
13--17) as one unit from spur gear housing (item
18). Lightly tap front end of spur gear housing
(item 18) with nylon mallet to dislodge spur gear
assembly if necessary.
6.9 Disassemble spur gear assembly (item 13--17).
6.9.1 Remove o--ring (item 17) from spur gear pin
(item 14).
6.9.2 Remove retaining ring (item 16), ball bear-
ing (item 15) and spur gear pin (item 14)
from spur gear (item 13).
6.9.3 Press ball bearing (item 15) from spur gear
pin (item 14).
For Tools with Roller Bearings on Crown Gear:
6.10 Remove crown gear hex nut (item 21).
6.10.1 Use a 5 mm allen wrench to hold crown gear
pin (item 54) from moving while unscrew-
ing crown gear hex nut (item 21). Note: Use
heat to loosen hex nut if necessary.
6.11 Remove o--ring (item 17) from back end of spur
gear housing (item 18).
6.12 Remove entire crown gear assembly (items
46--54) as one unit from spur gear housing (item
18). Lightly tap front end of spur gear housing
with nylon mallet to dislodge spur gear assem-
bly if necessary.
6.13 Disassembly crown gear assembly (item
46--54). Be careful not to lose or damage shims.
6.13.1 Remove shims (item 46).
6.13.1.1 Label or mark shims between bearing
cone (item 47) and spur gear housing
(item 18) to aid in re--assembly if both
existing crown gear (item 49) and spur
gear (item 50) are not replaced. Make
note of the size and location of the shims
for proper installation.
6.14 Remove crown gear pin (item 54).
6.15 Remove bearing cones (item 47) from bearing
cups (item 48).
6.15.1 Remove bearing spacer (item 53) and shims
from between bearing cups (item 48).
6.15.1.1 Label or mark shims between bearing
cones (item 47) to aid in re--assembly if
both existing bearing cones and bearing
cups are not replaced. Make note of the
size and location of the shims for proper
installation.
6.16 Remove bearing cups (item 48) from spur and
crown gear assembly. Jarvis special tool
8039167 is available. See Figure E on page 8.
Be careful not to score any parts.
6.17 Remove retaining ring (item 52) and press spur
gear (item 50) and keys (item 51) from crown
gear (item 49).
6.18 Clean and inspect all parts for wear and replace
as necessary.
For Tools with Ball Bearings on Crown Gear:
6.19 Remove crown gear hex nuts (item 23).
6.19.1 Use a 5 mm allen wrench to hold crown gear
pin (item 56) from moving while unscrew-
ing crown gear hex nut. Note: Use heat to
loosen hex nut if necessary.
6.20 Remove entire crown gear assembly (items 15,
50--52, 56 and 57) as one unit from spur gear
housing (item 18). Lightly tap front end of spur
gear housing with nylon mallet to dislodge spur
gear assembly if necessary.
6.21 Disassembly crown gear assembly (items 15,
50--52, 56 and 57).
6.21.1 Remove crown gear pin (item 56).
6.21.2 Remove retaining ring (item 52) and press
spur gear (item 50) and keys (item 51) from
crown gear (item 57).
6.21.3 Remove ball bearing (item 15) from crown
gear (item 57).
6.21.4 Remove flanged washer (item 22) and
flanged spacer (item 58) from spur gear
housing (item 18).
6.22 Clean and inspect all parts for wear and replace
as necessary.
7 SPUR GEAR HOUSING ASSEMBLY:
7.1 Reverse procedures and steps outlined in section
6. See special notes below.

maintenance instructions
Model MCS 300
page 13 of 16
®
JARVIS
6201010:.
PRODUCTS CORPORATION
33 ANDERSON ROAD, MIDDLETOWN, CONNECTICUT 06457--4926
UNITED STATES OF AMERICA E--MAIL. [email protected]
TEL. [phone] FAX. [phone] WWW. jarvisproducts.com
For Tools with Roller Bearings on Crown Gear:
7.1.1 Make sure pinion gear and planetary hous-
ing assembly (items 24--44) are installed be-
fore making any backlash adjustments and
prior to installing crown gear assembly
(items 46--54).
7.1.2 Press one bearing cup (item 48) into gear
side of crown gear (item 49). Press the
bearing cup in fully.
7.1.3 Press the remaining bearing cup (item 48)
into flat side of crown gear (item 49). Press
the bearing cup in fully.
7.1.4 Make sure bevel end of retaining ring (item
52) is facing away from spur gear (item 50)
when installing onto crown gear (item 49).
See Figure 3.
7.1.5 Make sure shims (item 46) and bearing
spacer (item 53) are installed in exact loca-
tion and according to size noted in steps
6.13.1.1 and 6.15.1.1.
CROWN
GEAR
NOTE BEVEL
DIRECTION
SPUR GEAR
RETAINING
RING
Figure 3
7.1.6 If replacing tapered bearing cones and cups
(items 47 and 48), proper clearance between
them must be set with bearing spacer (item
53) and shims (item 46). Note: Shim pack-
age (item 46) contains 5 shims 0.1 mm thick
and 5 shims 0.2 mm thick. Install only as
many shims as necessary to achieve proper
clearance. Refer to Figure 4 as a guide for
proper placement of shims and orientation
of bearing cones and cups.
7.1.7 Remove all grease from bearings to proper-
ly feel the clearance of the bearings.
7.1.8 Install the crown gear pin (item 54), bearing
cone (item 47), crown and spur gear assem-
bly (items 49--52), bearing spacer (item 53),
three thick shims (item 46) and other bear-
ing cone (item 47) into the spur gear housing
(item 18).
7.1.9 Tighten crown gear pin (item 54). Check
the clearance on the bearing cones (item
47). The bearing cones should rotate freely
with no axial play. Decrease shim (item 46)
thickness until all axial play is eliminated,
while still allowing cones to rotate freely.
7.1.9.1 When assembled with crown gear hex
nut (item 21) tight, there should be a
slight resistance to the rotation of the
spur gear assembly on the spur gear pin
(item 14). A slight clearance between
the bearing cone and bearing cup is ac-
ceptable as long as the crown gear as-
sembly is stable with no side to side play
on the crown gear pin (item 54). Refer
to Figure 4 as a guide.
7.1.9.2 If bearing cones are tight, increase shim
thickness until proper clearance is
achieved.
7.1.9.3 If bearing cones are loose, decrease
shim thickness until proper clearance is
achieved.
7.1.10 Remove the crown gear assembly (items
47--54).
7.1.11 Re--install the crown gear assembly (items
47--54) adding at least two shims (item 46)
between the spur gear housing (item 18) and
bearing cone (item 47). Make sure bearing
cones and bearing cups are installed correct-
ly.
7.1.12 Tighten crown gear pin (item 54).
7.1.13 Check the backlash between crown gear
(item 49) and pinion gear (item 43). Rotate
the shaft of the pinion gear. The bevel gears
should not have too much backlash nor be
too tight. The ideal backlash is
0.004--0.005”. Increase the shim (item 46)
thickness to increase the backlash; decrease
the shim thickness to reduce the backlash.
See Figure 4.

maintenance instructions
Model MCS 300 page 14 of 16
®
JARVIS
6201010:.
PRODUCTS CORPORATION
33 ANDERSON ROAD, MIDDLETOWN, CONNECTICUT 06457--4926
UNITED STATES OF AMERICA E--MAIL. [email protected]
TEL. [phone] FAX. [phone] WWW. jarvisproducts.com
Figure 4
Bearing Cone Clearance
and Backlash Adjustment
Place or Remove Shims Here to Set
Bearing Cone Clearance
Spacer Bearing Cone Clearance Setting
Bearing Cone
Spur Gear Notes
1. Set bearing cone clearance.
IF tight, add shims to achieve proper fit.
IF loose, remove shims to achieve proper fit.
2. Backlash of crown gear should be 0.004” to 0.005”.
3. Use Loctite 271on threads of spur and crown gear pins.
4. Pack all bearing cones and cups with Jarvis 1315 White
Grease when clearance adjustments are completed.
Spur Gear
Housing Bearing Cup
Place Shims Here to Set Bearing
Crown Gear Backlash
Planetary
Housing
Crown
Gear
7.1.14 After determining the correct amount of
shims (item 46), remove the crown gear as-
sembly and shims (items 46--54).
7.1.15 Pack bearing cones and bearing cups with
Jarvis 1315 White Grease.
7.1.16 Reinstall crown gear assembly and shims.
Apply Loctite 271 to threads of crown gear
pin (item 54).
For all Tools:
7.1.17 Fill the cavity of spur gear housing (item 18)
with Jarvis 1315 White Grease.
7.1.18 Make sure beveled end of retaining ring
(item 16) is facing toward spur gear housing
(item 18) when installing into spur gear
(item 13). See Figure 5.
7.1.19 Apply Loctite 271 on threads of spur gear
pin (item 14).
7.1.20 Make sure o--rings (items 11 and 17) are
seated and installed properly in grooves of
spur gear housing (item 18) and spur gear
pin (item 14). Apply a light coat of Jarvis
1315 White Grease to o--rings to keep them
in place when assembling, if necessary.
SPUR GEAR
NOTE BEVEL
DIRECTION
RETAINING
RING
Figure 5
SPUR GEAR PIN
GEAR HOUSING
BALL BEARING
8 PLANETARY HOUSING DISASSEMBLY:
8.1 Separate planetary housing assembly (items
24--44) as a complete unit from spur gear hous-
ing (item 18). Follow steps and procedures out-
lined in section 6, steps 6.1--6.6.
8.2 Remove flat head screw (item 37) and pinion
gear washer (item 36).
8.3 Remove planetary gear assembly (items 35 and
38--41) from pinion gear (item 43). Lightly tap
motor housing end of planetary housing (item
45) with nylon mallet to dislodge planetary gear
assembly if necessary.

maintenance instructions
Model MCS 300
page 15 of 16
®
JARVIS
6201010:.
PRODUCTS CORPORATION
33 ANDERSON ROAD, MIDDLETOWN, CONNECTICUT 06457--4926
UNITED STATES OF AMERICA E--MAIL. [email protected]
TEL. [phone] FAX. [phone] WWW. jarvisproducts.com
8.4 Remove retaining rings (item 38).
8.5 Remove planetary gear pins (item 41), planet
gears (item 39) and needle bearings (item 40)
from planetary gear hub (item 35). Use a drive
punch if necessary.
8.6 Remove planetary gear pins (item 41) and
needle bearings (item 40) from planet gears
(item 39). Jarvis special tool 8039168 is avail-
able. See Figure E on page 8. Be careful not to
score any parts.
8.7 Remove retaining ring (item 34).
8.8 Remove pinion gear (item 43), ball bearing
(item 33), inner race (item 42) and key (item 32)
from planetary housing (item 45). Lightly tap
gear housing end of planetary housing with ny-
lon mallet to dislodge pinion gear assembly.
Use and arbor press if necessary.
8.9 Remove key (item 32).
8.10 Press ball bearing (item 33) and inner race (item
42) from pinion gear (item 43).
8.11 Remove o--ring (item 24).
8.12 Press needle bearing (item 28) from planetary
housing (item 45).
8.13 Clean and inspect all parts for wear and replace
as necessary.
9 PLANETARY HOUSING ASSEMBLY:
9.1 Reverse procedures and steps outlined in section
8. See notes below.
9.1.1 Make sure o--ring (item 24) is seated proper-
ly in planetary housing.
9.1.2 Make sure bevel end of retaining ring (item
34) is facing toward air motor housing
when installed into planetary housing (item
45). See Figure 6.
AIR MOTOR
HOUSING
ROTOR
NOTE BEVEL
DIRECTION
RETAINING RING
Figure 6
GEAR HOUSING
BALL BEARING
10 MOTOR HOUSING DISASSEMBLY:
10.1 Remove cheese head screws (item 77) and lock
washers (item 76).
10.2 Separate the motor housing assembly and rear
handle assembly as a complete unit from plane-
tary housing assembly.
10.3 Separate the motor housing assembly from rear
handle assembly.
10.4 Slide motor housing assembly (items 62--69, 98
and 99) from motor housing (item 60). For ease
of removal and installation, use a heat gun to ap-
ply heat to motor housing, if necessary.
10.5 Remove rotor screw (item 69). Use 12 mm
wrench on flats on rotor to prevent rotor from
turning.
10.6 Lift off rear motor plate (item 98) and ball bear-
ing (item 62) from air motor sleeve (item 68).
Use a drive punch if necessary. See note below.
10.6.1 Place drive punch in hole of rotor shaft and
lightly tap until rear motor plate and ball
bearing is free from rotor shaft.
10.7 Slide rotor and bearing assembly (items 62--67)
from air motor sleeve (item 68).
10.8 Remove dowel pins (item 99) if necessary.
10.9 Remove vanes (item 66).
10.10 Press ball bearing (item 62) from splined end of
rotor (item 65). Remove wave spring (item 63).
10.11 Remove o--ring (item 59) from motor housing
(item 60).
10.12 Clean and inspect all parts for wear and replace
as necessary.

maintenance instructions
Model MCS 300 page 16 of 16
®
JARVIS
6201010:.
PRODUCTS CORPORATION
33 ANDERSON ROAD, MIDDLETOWN, CONNECTICUT 06457--4926
UNITED STATES OF AMERICA E--MAIL. [email protected]
TEL. [phone] FAX. [phone] WWW. jarvisproducts.com
AIR MOTOR
HOUSING
ROTOR
Figure 7 REAR HANDLE
ASSEMBLY
CHEESE HEAD
SCREWS
Notes
1. Tightened cheese head screws evenly in a crisscross pattern.
2. Make sure rotor rotates freely as you tightened screws.
1
2
3
4
CRISSCROSS
PATTERN
11 MOTOR HOUSING ASSEMBLY:
11.1 Reverse procedures and steps outlined in section
6. See notes below.
11.1.1 Make sure o--ring (items 59) is seated prop-
erly in motor housing.
11.1.2 Install motor housing assembly (items
62--69, 98 and 99) as a complete unit into
motor housing. For ease of removal and
installation, use a heat gun to apply heat to
motor housing, if necessary.
11.1.3 When installing rear handle assembly,
tighten cheese head screws (item 77) evenly
using a crisscross pattern. Make sure rotor
(item 65) rotates freely as you tighten
cheese head screws. Refer to Figure 7 as a
guide.
12 HANDLE AND VALVE HOUSING DISASSEM-
BLY:
12.1 Remove cheese head screws (item 77) and lock
washers (item 76).
12.2 Separate the motor housing assembly and rear
handle assembly as a complete unit from inter-
mediate housing assembly.
12.3 Separate the motor housing assembly from rear
handle assembly.
12.4 Remove threaded pin (item 96) from handle and
valve housing (item 74 or 109).
12.5 Remove trigger (item 73 or 108) from handle
and valve housing (item 74 or 109).
12.6 Press bushing (item 72) and dowel pin (item 71)
from trigger (item 73 or 108) if necessary.
For Single Trigger Tools:
12.7 Remove valve plug (item 85), o--ring (item 86)
and compression spring (item 87) from handle
and valve assembly.
12.8 Slide valve plunger assembly (items 88--93)
from handle and valve housing as a complete
unit.
12.9 Unscrew valve screw and spring guide (item 88)
from valve plunger (item 93) and separate
plunger assembly.
12.10 Remove external retaining ring (item 92) and
valve seal (item 91) from seal housing (item 90).
12.11 Remove o--ring (item 89) from valve screw and
spring guide (item 88).
For Dual Trigger Tools:
12.12 Remove threaded plug (item 104) and valve
(item 103) from rear handle and valve assembly.
12.13 Remove locking screws (item 107) and trigger
guard (item 106) from front handle (item 101).
12.14 Remove dowel pin (item 102) and front trigger
lever (item 105).
12.15 Remove threaded plug (item 104) and valve
(item 103) from front handle and valve assem-
bly.
For All Tools:
12.16 Remove o--rings (items 70 and 97).
12.17 Clean and inspect all parts for wear and replace
as necessary.
13 HANDLE AND VALVE HOUSING ASSEMBLY:
13.1 Reverse procedures and steps outlined in section
8. See notes below.
13.1.1 Make sure o--rings (items 59, 70, 86 and 97)
are seated properly.
13.1.2 Make sure valve plunger (item 93) slides
freely through bushings (item 94). Note:
Bushings are press fitted into handle and
valve housing and usually do not need to be
removed.
13.1.3 When installing rear handle assembly,
tighten cheese head screws (item 77) evenly
using a crisscross pattern. Make sure rotor
(item 65) rotates freely as you tighten
cheese head screws. Refer to Figure 7 as a
guide.