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Thank you for purchasing a Demco Lil’ Thumper pump. We feel you have made a wise choice and
hope you are completely satisfied with your new pump. If you have any questions regarding the applica-
tions of certain solutions or chemicals, contact your chemical supplier and follow chemical manufacturer
recommendations as well as all licensing and use restrictions or regulations.
GENERAL INFORMATION
1. Unless otherwise specified, high-strength (grade5)
(3 radial-line head markings) hex head bolts are
used throughout assembly of this sprayer.
2. Whenever terms “LEFT” and “RIGHT” are used in
this manual it means from a position behind sprayer
and facing forward.
3. When placing a parts order, refer to this manual for
proper part numbers and place order by PART NO.,
DESCRIPTION, and COLOR.
WARNING: TO AVOID PERSONAL INJURY OR PROPERTY DAMAGE, OBSERVE FOL-
LOWING INSTRUCTIONS:
Chemicals are dangerous. Know exactly what you’re going to do and what
is going to happen before attempting to work with these products. Improper
selection or use can injure people, animals, plants and soil.
Always wear protective clothing such as coveralls, goggles and gloves when
working with chemicals or sprayer.
Be sure to dispose of all unused chemicals or solutions in a proper and eco-
logically sound manner.
Table of Contents
General information ................................................................................................................................................. 2
Bolt Torque ............................................................................................................................................................... 3
Mounting the Pump and Lubrication Requirements ................................................................................................ 4
Rate Adjustment and Start-up Procedure ............................................................................................................... 5
Suggested Plumbing ............................................................................................................................................... 6
Single and Double Piston Parts Breakdown ............................................................................................................ 7
Single and Double Piston Pump Parts List .............................................................................................................. 8
Manual Clutch Parts Breakdown and Parts List ...................................................................................................... 9
Piston Wiper Replacement ...................................................................................................................................... 10 &11
Stackpack Replacement .......................................................................................................................................... 12
Determining Sprocket Ratios For Piston Pumps ..................................................................................................... 13
Routine Maintenance and Maintenance Record ..................................................................................................... 14
Trouble Shooting and Pump Storage ....................................................................................................................... 15
Pump and Sprayer Checklist ................................................................................................................................... 16
Return Procedures for Chemical Pumps or Related Items
All pumps or related items must be flushed of any chemical (ref. OSHA Section 0910.1200 (d)(e)(f)(g)(h)
and hazardous chemicals must be labeled before being shipped to or carried into Demco for service or
warranty consideration. Demco reserves the right to request a Material Safety Data Sheet from the Pur-
chaser for any pump or related items Demco deems necessary. Demco reserves the right to “disposition
as scrap” pumps or related items returned which contain unknown substances, or to charge for any and all
costs incurred for chemical testing and proper disposal of components containing unknown substances.
Demco request this in order to protect Demco personnel and the environment from the hazards of hand-
ing unknown substances.
WARRANTY POLICY, OPERATOR MANUALS & REGISTRATION
Go online to www.demco-products.com to review Demco warranty policies, operator manuals and register your Demco product.
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