AB20021 - Single Axle 750 & 1000 Gallon ... - Demco Products

2-4-94
AB20021, Rev.1
SINGLE AXLE
FOR 750 & 1000 GALLON
"BIG WHEEL" SPRAYER
WITH PISTON PUMP
OWNERS MANUAL
INSTALLATION
MAINTENANCE
REPLACEMENT PARTS
READ complete manual CAREFULLY
BEFORE attempting operation.
DEMCO • Dethmers Mfg. Co. • P.O. Box 189 • 4010 320th Street • Boyden, IA 51234
PH: (712) 725-2311 or (712) 725-2302 • Toll Free: 1-800-543-3626 • FAX: (712) 725-2380

ASSEMBLY INSTRUCTIONS FOR SINGLE AXLE WITH PISTON PUMP
1. After the undercarriage is attached to the main frame,
slide Axle (#2) into the Undercarriage (#1) so that your
particular row spacing is achieved. (REFER to View A).
Secure slide in axle tube using one 5/8" x 6" hex head bolt
(#3), 5/8" x 7" hex head bolt (#4) and four 5/8" flat washers
(#6), and two 5/8" nylon insert locknuts (#5).
8. Attach the Piston Pump to the Left PP Mount using two
3/8" x 1-1/4" hex head bolts (#39), 3/8" flatwashers (#40)
and 3/8" nylon insert locknuts (#33). Then attach the Piston
Pump and the Chain Tightener Bracket (#38) to the Right
PP Mount using four 3/8" x 1-1/4" hex head bolts (#39),
3/8" flatwashers (#40) and 3/8" nylon insert locknuts (#33).
If you are attaching a Piston Pump to your single axle
sprayer skip to step #4
2. Attach the two Spindle Mounts (#7) to the two Slide-in-
Axle Tube using Spindle Mount, twelve 5/8" x 2" hex head
bolts (#8), and nylon insert locknuts (#5).
3. Attach rim and tire assembly to the Hub (#20) using eight
5/8" lug bolts (#21).
4. Attach the Spindle Mount (#7) to the Right Side Slide-in-
Axle Tube using, six 5/8" x 2" hex head bolts (#8), and
nylon insert locknuts. Attach the Spindle Mount (#7) and
the Bearing Mount Angle Plate (#10) to the Left Side Slidein-Axle
Tube using Spindle Mount, four 5/8" x 2" hex head
bolts (#8), two 5/8" x 2-1/2" hex head bolts (#9),and six
5/8" nylon insert locknuts (#5) .
NOTE: Use 5/8" x 2-1/2" bolts in Holes A and B.
5. When The Piston Pump is used remove the Hub (#20) by
removing Hub Cap (#27), Cotter Pin (#25) and Castle Nut
(#26). Slide the hub off the shaft. Do not drop bearing
onto ground and do not cut or ruin seal. Bolt the
Sprocket Mounting Plate (#14) to the back side of the Hub
(#20) using four 1/2" x 1" fine thread bolts (#15) and 1/2"
lockwasher (#16). Bolt the 50 tooth sprocket (#11) to the
Sprocket Mounting Plate using five 3/8" x 3/4" bolts (#12)
and 3/8" lockwashers (#13).
6. Reinstall the hub onto the spindle making sure the inside
bearing is seated properly into bearing race. Place ouside
bearing onto shaft and into bearing race of hub. Install
washer and nut. Torque nut to 25 - 30 foot-lbs. with out
spinning the hub, loosen nut and spin nut back on so it is
finger tight. Replace cotter pin and Hub Cap. Mount the
rim and tire assembly using eight 5/8" x 1-1/2" fine thread
lug bolts (#21).
9. Attach the Idler Sprocket (#42) to the Chain Tightener
Bracket using one 1/2" x 2-1/4" hex head bolt (#41), four
1/2" flatwashers (#43) and one 1/2" nylon insert locknut
(#43). Use flatwashers to align Idler Sprocket.
10.Bolt the Bearing Channel Mount (#34) to the Under Carriage
between the PP Mounts using two 3/8" x 6" hex head
bolts (#36), two 3/8" nylon insert locknuts (#33), and one
Bearing Channel Back Plate (#35).
11.Attach the two Pillow Block Bearings (#45) to the Bearing
Mount Angle Plate (#10) and the Bearing Channel Mount
(#34), using four 7/16" x 1-1/2" hex head bolts (#46) and
7/16" nylon insert locknut (#47) and eight 3/8" flatwashers
(#40).
12.Insert the shaft into the pillow block bearings making sure
the bearing lock collars are on the inside of pillow block
bearings. Do not lock collars at this time. Place the 18 tooth
Sprocket toward the wheel and place the 24 tooth sprocket
toward the PP with the hubs facing toward the pillow block
bearing. Line up sprockets tighten set screws on sprockets
and lock collars on pillow block bearings. Attach Wheel
Drive Chain (#53). Tighten chain by sliding the bearing in
the slots. If proper tension of the chain cannot be achieved
insert the proper number of Bearing Shims between the
pillow block bearings and Bearing Mount Angle Plate. Insert
the same number of shims between the pillow block bearings
and Bearing Channel Mount. Route the Idler Chain
(#54) as shown and tighten by sliding in the slots on the
chain tightener bracket. Make sure all fasteners are tight
before using sprayer.
7. When mounting a double piston pump to the under
carriage attach the Right Piston Pump Mount (#29) to the
Under Carriage (#1) 6-1/2" from edge of frame to the
mount and mount the Left Piston Pump Mount 5-1/4"
between brackets when mounting a single PP and
10-1/2" when mounting a double PP using four 3/8" x
8-1/2" bolts (#31), 3/8" nylon insert locknuts (#33), and
two Piston Pump Mount Back Plates (#32).
5-1/4"-Single PP
10-1/2" Double PP
6-1/2"
BIG WHEEL
120" SPACING
VIEW A

SINGLE AXLE WITH PISTON PUMP PARTS BREAKDOWN
REF.
NO.
PART
NO. QTY. DESCRIPTION
1. 07904 1 79-3/4" Under Carriage
- 03610 1 98-1/4" Under Carriage
2. 07905 1 40" Slide-In Axle Tube
- 03611 1 49-1/2" Slide-In Axle Tube
3. 01962 2 5/8"-11 UNC x 6" Hex Head Bolt Gr.5
4. 04836 2 5/8"-11 UNC x 7" Hex Head Bolt Gr. 5
5. 02587 16 5/8"-11 UNC Nylon Insert Locknut
6. 00447 8 5/8" Flat Washer
7. 03612 2 Spindle Mount
- 07170 - Spindle Only
8. 00290 10 5/8"-11 UNC x 2" Hex Head Bolt Gr.5
9. 04058 2 5/8"-11 UNC x 2-1/2" Hex Head Bolt Gr.5
10. 03615 1 Bearing Mount Angle Plate
11. 01187 1 50 Tooth Sprocket
12. 01899 5 3/8"-16UNC x 3/4" Hex Head Bolt Gr. 5
13. 00060 5 3/8" Lock Washer
1
3
6
53
37
41
42
38
43 44
51 45
52
46
34
33
39
40
55 29
5
47
32
31
33
30
35
6
5
36
REF.
NO.
PART
NO. QTY. DESCRIPTION
14. 03622 1 Sprocket Mounting Plate
15. 02010 4 1/2"-20 UNF x 1" Hex Head Bolt Gr.5
16. 00084 4 1/2" Lock Washer
5181 2 Wheel Hub Assembly (Includes #17-27)
17. 01944 2 Oil Seal (906486)
18. 01943 2 Inner Cup (JLM506810)
19. 01942 2 Inner Cone Bearing (JLM506849)
20. 01941 2 8 Bolt Hub (W 80-8)
21. 01939 16 5/8"-18UNF x 1-1/2" Lug Bolt (for W80-8 hub)
22. 01938 2 Outer Cup (LM501310)
23. 01937 2 Outer Cone Bearing (LM501349)
24. 01936 2 1-1/16" I.D. x 2-1/8" O.D. Flatwasher
25. 01935 2 3/16" x 2-1/2" Lg. Cotter Pin
26. 01934 2 1"-14UNF Castle Nut
27. 01933 2 Hub Cap (909912)
28. 07481 2 12 x 38-8 Bolt Rim, Tire & Tube
29. 03616 1 Piston Pump Right Mount
30. 03617 1 Piston Pump Left Mount
31. 00782 4 3/8-16UNC x 8-1/2" Hex Head Bolt Gr. 5
32. 03618 2 Piston Pump Mount Back Plate
33. 02592 10 3/8"-16UNC Nylon Insert Locknut
34. 03620 1 Bearing Channel Mount
35. 03621 1 Bearing Channel Back Plate
36. 00613 2 3/8"-16UNC x 6" Hex Head Bolt Gr. 5
37. PP2ES 1 Double Piston Pump with Electric shutoff
38. 03614 1 Chain Tightener Bracket
39. 00523 4 3/8"-16UNC x 1-1/4" Hex Head Bolt Gr. 5
40. 00059 12 3/8" Flat Washer
41. 00348 1 1/2"-13 UNC x 2-1/4" Hex Head Bolt
42. 05728 1 Idler Sprocket-17 tooth
43. 00085 4 1/2" Flat Washer
44. 02178 1 1/2"-13 UNC Nylon Insert Locknut
45. 03625 2 1" Pillow Block Bearing
46. 04050 4 7/16"-14UNC x 1-1/2" Hex Head Bolt Gr.5
47. 02771 4 7/16"-14UNC x Nylon Insert Locknut
48. 03703 8 Bearing Shim
49. 03619 1 Drive Shaft 1" x 35-1/2"
50. 05651 1 18 Tooth Sprocket with 1" Bore
51. 09045 1 36 Tooth Sprocket with 1" Bore
52. 03717 2 1/4" x 1-1/2" Square Key
53. 05733 2 1/4"-20UNC x 1" Square Head Set Screw
54. 03624 1 38" #50 Drive Chain (Wheel Drive)
55. 09137 1 47" #50 Drive Chain (Idler Drive)
Please order replacement parts by PART NO. and DESCRIPTION.
5
4
2
A
B
8
LEFT SIDE
15 16
14
17 18
19
20
49
46
7
45
48
10
53
47
12 13
11
9
54
22
23
24
26
27
28
50
25
21

SPRAYER CHECKLIST:
Downtime in the fields caused by field breakdowns is costly and time consuming. Many breakdowns can be eliminated
by periodic equipment maintenance. By spending a little time reviewing this checklist before seasonal spraying
application time and following proper after-season care, you can save time and money later on.
Check Before Going To The Field:
1. NOZZLES
Check the tip for excessive wear by checking for grooves
in or near the tip opening. Check the nozzle spacing by
starting at center and working outwards. Check boom for
proper height.
2. HOSES
Check all hoses for worn or soft spots. Be sure all hose
clamps are tightened. Be sure no hoses are kinked or
pinched. Check for leakage in any of the lines.
3. TANK
Remove and clean the agitator orifices. Check the orifices
for excessive wear by checking for grooves in or
near the orifice opening. Be sure the tank tie down bands
are tight. Inspect fittings and gaskets to insure they are in
good condition.
4. CONTROLS
Check for leakage, plugging, or wear on all valves,
fittings, etc. Clean off any build up of foreign material. Be
sure the pressure gauge is working properly. Clean the
strainer and make sure the “O” ring is not cracked as this
could cause leakage.
After Season Care:
1. After spraying chemicals, run water mixed with cleaners
through the tank, pump and all hose hookups. If wettable
powder dries out in the system, it is very difficult to put
back into suspension and can cause malfunction, damage
or injury.
2. The tank, when cleaned, should have all openings closed
or covered to keep dirt from blowing in.
3. The pump should be flushed with soluble oil and the
pump ports plugged to keep out moisture and air.
4. Clean the strainer thoroughly.
5. Disassemble the tips and rinse with water or cleaning
solution. (Appropriate for chemical sprayed).
6. Clean the tip opening with a wooden toothpick. Never use
wire or a hard object that could distort the opening.
7. Water rinse and dry the tips before storing.
5. PUMP
Check to be sure the pump turns freely. Be sure to prime
the agitation pump before starting to prevent damage to
the seals. Check the PTO shaft knuckles and be sure the
set screw is tight and the drive pin is in place and grease
PTO shaft.
6. FRAME
Be sure all bolts are tightened. Be sure to grease all
grease fittings. Check sprayer tire pressure and grease
the axle.
7. SPRAYER
Replace all worn or damaged parts.
SAFETY FIRST
To keep the sprayer from tipping backwards when unhitching
from the tractor: For HPS, always lower the rear
safety stand. For HPT, make sure weight transfer spring
tension is correct for proper tongue weight.
Keep the PTO Shaft as level as possible between the
pump shaft and tractor PTO to minimize PTO jumping
from an excessive angle which could result in pump or
PTO damage.
Take note after the sprayer is hitched to the tractor draw
bar that the end of the PTO shaft that goes on the tractor
PTO is at least 3 feet from the pump shaft. The pump shaft
could be broken off when turning sharp corners if this is
not done.
KEEP HANDS, FEET, AND LOOSE CLOTHING AWAY FROM ROTATING PARTS.
NOTE: DETHMERS MANUFACTURING COMPANY does not and will not make any recommendations concerning the
application of various chemicals or solutions. These recommendations relate to either amount or procedure
of materials applied.
If you have any questions regarding the application of certain chemicals or solutions, contact your chemical
supplier and follow chemical manufacturer recommendations.
DEMCO • Dethmers Mfg. Co. • 4010 320th STREET • P.O. BOX 189 • BOYDEN, IOWA 51234