Model 424 Wellsaw
Air Powered Reciprocating
Saw
EQUIPMENT
SELECTION Ordering No..............
Model 424
End Cutting with 8 inch Blade 4005240..
End Cutting with 16 inch Blade 4005241.
Heavy Duty with 8 inch Blade 4005242...
Heavy Duty with 16 inch Blade 4005243.
Blades
16 inch end cutting 1023121............
8 inch end cutting 1023122.............
8 inch heavy duty 1023123.............
16 inch heavy duty 1023124............
Supports
16 inch heavy duty 1058072............
8 inch heavy duty 1058073.............
8 inch end cutting 1058076.............
16 inch end cutting 1058077............
Accessories
Air Hose, 16 ft 1059015................
Air Filter/Regulator/Lubricator 3022003..
Balancer 4042028.....................
TABLE OF
CONTENTS Page.........................
• Safety Messages to Employer and
Safety Director 2...................
• Safety Messages to Operators,
Maintenance and Cleanup Personnel 3
• Parts Diagram and List 4............
• Specifications 6....................
• Installation Instructions 6............
• Operation Instructions 6.............
• Maintenance Instructions 7..........
JARVIS
6205001a
PRODUCTS CORPORATION
®
33 ANDERSON ROAD, MIDDLETOWN, CONNECTICUT 06457-4926
UNITED STATES OF AMERICA E--MAIL.
TEL. 860-347-7271 FAX. 860-347-6978 WWW. jarvisproducts.com
jarvis.products.corp@snet.net
MODEL 424
safety messages to employer
and safety director
page 2 of 8
Keep hands clear.
SAFETY MESSAGES TO EMPLOYER AND SAFETY DIRECTOR
AVOID INJURY
1. Ensure that employees wear eye protection in accordance with OSHA’s eye and face protection requirements (29 CFR 1910.133) at all times.
2. Follow our installation and maintenance instructions for proper installation and care of the tool.
3. Enclosed are 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.
4. The tool is designed and intended to be powerful. That fact should be obvious to your employees,
but you must emphasize it to them.
5. Always disconnect the tool from its power supply when it is not in use.
6. 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.
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 appropriate prevention. See OSHA’s “Ergonomics Program Management Guidelines for Meat Packing Plants.”
8. Remove and repair any tool that malfunctions. All personnel must be instructed to remove any
malfunctioning equipment.
9. Never make modifications or alterations to the tool. Replace any missing or illegible labels.
10. Avoid injury. Do not permit the tool to be misused.
11. If you resell or distributea Jarvisproduct, you mustprovide thepurchaser with theappropriate safe-
ty sheets and tool brochure. Additional copies of safety sheets and tool brochures will be provided
upon request.
JARVIS
6205001
PRODUCTS CORPORATION
®
33 ANDERSON ROAD, MIDDLETOWN, CONNECTICUT 06457-4926
UNITED STATES OF AMERICA E--MAIL.
TEL. 860-347-7271 FAX. 860-347-6978 WWW. jarvisproducts.com
jarvis.products.corp@snet.net
safety messages to operators,
maintenance and cleanup personnel
page 3 of 8
MODEL 424
Keep hands clear.
SAFETY MESSAGES TO OPERATORS, MAINTENANCE AND CLEANUP
PERSONNEL
REMOVE ANY MALFUNCTIONING TOOL FROM SERVICE
REPORT ANY PROBLEMS TO YOUR SUPERVISOR
1. Disconnect the power supply in accordance with OSHA’s lockout/tagout procedures (29 CFR
1910.147) before changing the blade.
2. Disconnect the power supply in accordance with OSHA’s lockout/tagout procedures (29 CFR
1910.147) before performing any repair or maintenance.
3. Disconnect the power supply -- or have the power supply disconnected -- in accordance withOSHA’s
lockout/tagout procedures (29 CFR 1910.147) before performing any cleanup.
4. Disconnect the power supply when the tool is not in use.
5. Always wear eye protection in accordance with OSHA’s eye and face protection requirements (29
CFR 1910.133), and when needed, a dust mask.
6. Do not operate near flammable liquids or in gaseous atmospheres.
7. Do not operate in outdoor locations or in damp or wet locations.
8. Do not overreach; keep proper footing and balance when using the tool.
9. Never put fingers, hands or other parts of the body on the cutting edge of the blade or in the cutting
path.
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.
11. T est the tool prior to use or daily. Depress the trigger and the tool should
and the tool should stop. If the tool malfunctions, remove it from service and report or repair it im-
mediately.
start. Release the trigger
12. Never depress the trigger unless you are going to use or test the tool.
13. Never make any alterations to the tool. Report
JARVIS
6205001a
or replace any missing or illegible labels.
PRODUCTS CORPORATION
®
33 ANDERSON ROAD, MIDDLETOWN, CONNECTICUT 06457-4926
UNITED STATES OF AMERICA E--MAIL.
TEL. 860-347-7271 FAX. 860-347-6978 WWW. jarvisproducts.com
jarvis.products.corp@snet.net
MODEL 424
parts diagram
page 4 of 8
JARVIS
6205001
PRODUCTS CORPORATION
®
33 ANDERSON ROAD, MIDDLETOWN, CONNECTICUT 06457-4926
UNITED STATES OF AMERICA E--MAIL.
TEL. 860-347-7271 FAX. 860-347-6978 WWW. jarvisproducts.com
jarvis.products.corp@snet.net
parts list
page 5 of 8
ITEM PART NO. PART NAME QTY ITEM PART NO. PART NAME QTY
1 1017083 Danger Label 1
2 1055427 Flat Head Screw, Pkg. 12 4
3 1061186 Plastic Plug 1
4 1002191 Top Cover 1
5 1016206 Upper Motor Housing 1
6 1035259 O--ring 1
7 1014079 Spring 1
8 1073185 Socket Head Cap Screw 2
9 1013135 Retaining Ring 1
10 1021225 Ball Bearing 1
1 1 1032147 Upper End Plate 1
12 1010178 Roll Pin 2
13 1009077 Cylinder Sleeve 1
14 1040007 Air Motor Vanes 5
15 1064015 Rotor 1
16 1032146 Lower End Plate 1
17 1021551 Ball Bearing 1
18 1020131 Spindle 1
19 1026072 Pinion Gear 1
20 1016205 Lower Motor Housing 1
21 1035193 Seal 1
22 1055426 Flat Hd Scr & Lk Wshr, Pkg.12 4
23 1002193 Bottom Cover Plate 1
24 1035191 Gasket 1
25 1007164 Lock Nut 2
26 1021228 Needle Bearing 2
3028030 Rod and Bearing Assembly
(items 26 and 27)
27 1028060 Connecting Link 1
28 1029185 Spacer 1
29 1013310 External Retaining Ring 1
30 3026023 Gear, Bearing & Stud Assy 1
31 1020133 Gear Shaft 1
32 1021218 Thrust Bearing 1
33 1004149 Thrust Washer 1
34 1050236 Elbow 1
35 1050235 Long Nipple 1
36 1007162 Cap Nut 6
37 1007166 Gear Stud Nut 1
38 1016202 Saw Housing 1
39 1055429 Oval Head Screw 2
40 1027042 Handle Stud 1
41 1006021 Handle Knob 1
42 1058071 Blade Support, End Cut 8” 1
1058070 Blade Support, End Cut 16”
43 1023122 Blade, End Cutting 8 inch 1
1023121 Blade, End Cutting 16 inch
44 1058075 Blade Support, Heavt Duty, 8” 1
1058074 Bl Support, Heavy Duty, 16”
45 1023123 Blade, Heavy Duty 8 inch 1
1023124 Blade, Heavy Duty 16 inch
46 1055422 Socket Set Screw, Cup Pt. 1
47 1012050 Clamp Ring 1
48 3065010 Rod & Stud Assy with item 49 1
49 1027041 Drive Stud 1
50 1035192 Seal 2
51 1036116 Bushing 1
52 1017039 Nameplate Label 1
1017037 Wellsaw Label 1
53 1036120 Bushing 3
54 1012047 “U” Clip (rubber) 1
55 1012046 “S” Clip 1
56 1027048 Threaded Stud 3
57 1045013 Rivet 4
58 8030031 Hex Key 1
59 1002206 Blade Support Cover 1
60 1035126 IO--ring 2
61 1051050 Air Tube 1
62 1039032 Trigger Plunger 1
63 1021214 Bushing 1
64 1016203 Valve Housing with item 65 1
65 1055435 Locking Socket Set Screw 1
66 1022060 Valve Seat 1
67 1035064 O--ring 3
68 1022059 Air Valve 1
69 1014078 Compression Spring 1
70 1015007 Screen 1
71 1016204 Lower Valve Body 1
72 1055439 Oval Head Screw 6
73 1002200 Handle Cover 1
MODEL 424
JARVIS
6205001a
PRODUCTS CORPORATION
®
33 ANDERSON ROAD, MIDDLETOWN, CONNECTICUT 06457-4926
UNITED STATES OF AMERICA E--MAIL.
TEL. 860-347-7271 FAX. 860-347-6978 WWW. jarvisproducts.com
jarvis.products.corp@snet.net
MODEL 424
specifications, installation
and operation instructions
page 6 of 8
SPECIFICATIONS
Motor Power 1 hp 745 W
Operating Pressure 100 psi 6.9 bar
Air Consumption 28 ft3/min 0.8m3/min
Blade Speed 7500 cuts / min
Stroke 1.125 in 29 mm
Control Handle Single Trigger Pneumatic
Blade Length 8 in 203 mm
16 in 406 mm
Overall Length (w/16 in blade) 31 in 787 mm
Weight (without blade) 8.2 lbs 3.7 kg
INSTALLATION INSTRUCTIONS
1 Suspend the Model 424 Wellsaw from a balancer.
Jarvis part number 4042028 is available.
2 Make the necessary air connection.
2.1 The required compressed air supply is 28 ft
3
min at 100 psi. (0.8 m
/ min at 6.9 bars).
3
OPERATION INSTRUCTIONS
1 DAILY CHECKLIST:
1.1 Make sure that the compressed air supply is at
the correct pressure and that the lubricator is up
to the fullmark. Use Jarvis Air Mist Lubricator
Oil; if using a conventional air mist lubricator
set the feed rate at 8--10 drops per minute; if using 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 balancer.
1.3 Make sure that the saw is working correctly.
Depress the trigger and the tool should
Release the trigger and the tool should
the tool malfunctions, remove it from service
start.
stop. If
and report the problem to your supervisor immediately.
Always use two hands when starting and stopping the saw. Continue holding the saw firmly
with bothhands until the blade comes to acomplete stop.
2 AVERAGE CUTTING AND RIPPING:
2.1 Place your work piece on a solid support at a
convenient working height.
2.2 Adjust the material so that the line of cut will be
close to the support. Secure it firmly.
2.3 To prevent starting torque of the motor from
pulling the sawaway from line of cut, the operator should make a few short strokes until the
blade has cut into the material about 1/4 inch before squeezing trigger switch.
2.4 Both hands should be on the saw at all times
while cutting. Continue holding the tool with
both hands until the saw blade comes to a com-
/
plete stop.
2.5 The saw should be kept perpendicular to the
work piece while cutting material that is thicker
than one inch.
2.6 The saw should be pushed firmly into the material while cutting.
2.7 Do not allow the saw blade or the blade support
to leave the work piece while cutting.
2.8 Never allow the saw blade to float into the material while cutting.
2.9 Never permit any part of the saw, except the
blade and the blade support, to contact the work
piece during the cut.
3 CUTTING LARGE CROSS SECTIONS:
3.1 Rocking the saw in the cut will speed up the cutting action.
4 SINKING THE BLADE THROUGH A SUR -
FACE:
JARVIS
6205001
PRODUCTS CORPORATION
®
33 ANDERSON ROAD, MIDDLETOWN, CONNECTICUT 06457-4926
UNITED STATES OF AMERICA E--MAIL.
TEL. 860-347-7271 FAX. 860-347-6978 WWW. jarvisproducts.com
jarvis.products.corp@snet.net
operation and
maintenance instructions
page 7 of 8
MODEL 424
4.1 Yourpower hand saw is not designed for regular
use in starting its own hole by sinking blades
through a surface, commonly called “plunge
cutting”. If attempted, the operator must:
a. Keep the saw blade as parallel to the work
as possible.
b. Immediately, as the blade makes contact
with the work piece, start to draw the saw
back slowly from the starting point.
c. Repeat the operationoutlined in“b”, if nec-
essary.
d. Have room to draw the saw at least 4--6 in-
ches before cutting through a one inch
thickness.
e. Do not force the saw blade, but keep it
moving slowly on the draw back from the
starting point. After a break through cut
has beenmade and theend of the blade support extends through the material at least
1--1/2 inches, the saw may be tipped to a
normal cutting angle.
5 ALWAYS KEEP A SHARP BLADE ON THE
SAW:
5.1 Cutting with a dull or badly worn blade can
overload the saw and cause damage from overheating.
5.2 New blades can be purchased from Jarvis.
MAINTENANCE INSTRUCTIONS
IMPORTANT: ALW AYS DISCONNECT THE COMPRESSED 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 PERFORMING ANY MAINTENANCE OR REPAIRS.
Item numbers: refer to the parts diagram on page 4.
1 DAILY:
1.1 Inspect all hoses for cuts and abrasions and replace as necessary.
1.2 Check all fittings and connections for leaks and
tighten or replace as necessary.
1.3 An air filter/regulator/lubricator (
number 3022003) must be installed in the air
supply line. Keep the lubricator filled at all
times.
1.4 Make sure that the saw is working correctly.
Note: The air supply must be connected to perform this maintenance check only.
Depress the trigger and the tool should
Release the trigger and the tool should
the tool malfunctions, repair or remove it from
service immediately.
Always use two hands when starting and stopping the tool. Continue holding the saw firmly
with bothhands until the blade comes to acomplete stop.
2 WEEKLY:
2.1 Remove the bottom cover plate from saw housing (item 38).
2.2 Apply Jarvis 1315 White Grease to the pinion
and gear, bearing and stud assembly (items 19
and 30).
3 MONTHLY:
3.1 The gear case should be kept 1/3 full of grease.
To check the grease level, remove the bottom
cover plate (item 23) and its gasket (item 24).
Check more frequently for saws that are used
daily. Use Jarvis 1315 White Grease.
4 BLADE REMOVAL:
NOTE: Your Jarvis Wellsaw is equipped with a hex key
(item 58) for removing the blade. This wrench is located
in the housing directly behind the blade support.
4.1 Insert the hex key through the hole in the outer
end of blade (item 43) and pull the blade to the
outer end of its stroke.
Jarvis part
start.
stop. If
JARVIS
6205001a
PRODUCTS CORPORATION
®
33 ANDERSON ROAD, MIDDLETOWN, CONNECTICUT 06457-4926
UNITED STATES OF AMERICA E--MAIL.
TEL. 860-347-7271 FAX. 860-347-6978 WWW. jarvisproducts.com
jarvis.products.corp@snet.net
MODEL 424
maintenance instructions
page 8 of 8
4.2 Loosen the blade holding set screw (item 46)
about one half turn.
4.3 Reinsert the hex key in the hole at the outer end
of the blade and pull the blade out.
5 BLADE INSTALLATION:
5.1
STANDARD BLADE SUPPORT (End Cutting):
a. Align blade (item 43) with blade support
(item 42). The blade should extend approx-
imately three inches from the end of the
blade support.
b. Slide
c. Use a rubber hammer and tap the end of the
d. Tighten the set screw (item46) with the hex
5.2
HEAVY DUTY BLADE SUPPORT (Heavy Duty):
a. Place the slotted endof blade (item 45) into
b. Slide
5.3 Slide the blade into the rod and stud assembly
(item 48) as far as it will go.
5.4 Tighten the set screw (item 46) with the hex key
(item 58).
6 BLADE SUPPORT REMOVAL:
6.1 Remove cap nuts (items 36).
6.2 Remove blade support (item 42 or 44), threaded
stud (item 56) and bushings (item 53).
7 BLADE SUPPORT INSTALLATION:
7.1 Reverse steps 6.1 -- 6.2.
the blade onto the blade support until
the crimp in the bladeis touching theend of
the blade support.
blade towards the body of the saw until the
crimp in the blade slides into the slot in the
blade support.
key (item 58).
the guide in the blade support (item 44).
the blade over the blade support to-
wards the body of the saw. Make sure that
the tabs on the blade extend over each side
of the blade support.
8 GENERAL DISASSEMBLY:
8.1 Remove blade (item 43 or 45) and blade support
(item 42 or 44).
8.2 Remove handle cover (item 73).
8.3 Pull air conveying components (items 60--72)
out of saw housing (item 38).
8.4 Disassemble individual components as necessary.
8.5 Examine o--rings (item67), screen (item70) and
valve seat (item 66). Replace parts, if necessary.
8.6 Remove bottom cover plate (item 23) and gasket (item 24).
8.7 Insert a small block of wood between the connecting link (item 27) and the saw housing (item
38) to stop the rotation of the connecting link.
Remove lock nuts (item 25).
8.8 Remove connecting link (item 27); gear studnut
(item 37); gear, bearing and stud assembly(item
30) and drive stud (item 49).
8.9 Remove set screw (item 46), clamp ring (item
47) and rod and stud assembly (items 48 and 49)
from end of saw housing (item 38).
8.10 Remove and examine seals (item 50) and bushing (item 51).
8.11 Clean the gear housing cavity to remove any
contaminated lubricant.
8.12 Remove screws (item 2) and top cover (item 4).
8.13 Remove elbow (item 34) and long nipple (item
35) from lower motor housing (item 20).
8.14 Remove items 5--20 from saw housing (item
38).
8.15 Unthread pinion gear (item 19) from spindle
(item 18).
8.16 Disaasemble further as necessary to inspect part
for wear. Replace parts as required.
8.17 Reassemble by reversing these steps.
JARVIS
6205001
PRODUCTS CORPORATION
®
33 ANDERSON ROAD, MIDDLETOWN, CONNECTICUT 06457-4926
UNITED STATES OF AMERICA E--MAIL.
TEL. 860-347-7271 FAX. 860-347-6978 WWW. jarvisproducts.com
jarvis.products.corp@snet.net
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