morse 26, Operator'S Manual, Page: 5 / 8

The Specialist In Drum Handling Equipment
Drum Pumps
morsedrum.com
Copyright 2019 - Morse Mfg. Co., Inc. Form PL26 (Updated 11 Jun, 2019)
5
Maintenance
Use only original factory replacement parts
A. Disassembly
Remove hose (item 17) from housing. Unscrew suction and/or 1.
extension tubes (items 34 and 36).
Remove hex nuts (item 22) and screws (item 20) from 2.
housing. Remove cover plate and gasket (items 19 and 18),
being careful not to damage the gasket.
Remove large and small valve assemblies (items 24 and 3.
23) and inspect for broken or weak springs, or damaged or
clogged valves.
Remove hairpin clip (item 5), washer (item 4) and clevis pin 4.
(item 3) which hold the handle (item 2) to the piston rod.
Remove hairpin clip (item 6), flat washer (item 4) and clevis
pin (item 7) from links (item 8) at the pump housing (item 37).
Remove pin (item 3) from piston rod and set handle aside.
Slide piston assembly (item 28) from the housing.
Inspect teflon ring (item 30) in piston groove. It must extend 5.
about 1/32nd above the edge of the piston to seal properly. If
the ring is worn flush with the piston edge it must be replaced.
When removing the teflon ring be careful not to damage
the piston if tools are being used. Always replace the O-ring
(item 29) when replacing the teflon ring. The rubber O-ring is
compressed over time, reducing its ability to seal.
Inspect piston bore in housing (item 37) for wear. Any gouging 6.
or scraping would indicate that the liquid being pumped
contains abrasives. Replace the housing and teflon ring if the
surfaces are gouged or worn.
Remove the two screws (item 9) that hold the retaining plate 7.
(item 10) to the housing. Remove plate to expose piston rod
O-ring (item 11). Replace O-ring if worn.
B. Reassembly
Install the two small valve assemblies (item 23) in the housing 1.
first, then the two large assemblies (item 24). There is a small
tab molded into the valve seats which fits a guide channel
in the housing. This prevents installing the valve seats
backwards. If the tabs are broken, please note the following.
The suction valve seats (lower two) should have their a.
springs facing each other when installed.
The discharge valve seats (upper two) should have b.
springs facing away from each other.
Install piston rod O-ring (item 11). Install retainer plate (item 2.
10) with the groove facing AWAY from the pump housing.
Ensure piston (item 28) has O-ring (item 29) and teflon ring
(item 30) installed. Teflon ring will stretch enough to install
by hand (tools may damage the piston). Slide piston rod into
housing. The teflon ring will catch on the edge of the housing
while pushing the piston into the bore. To help seat the ring,
turn piston slowly while pushing ring into the grove with
fingers. DO NOT FORCE PISTON.
Inspect the cover plate gasket (item 18) for damage. 3.
Lay coverplate and gasket on housing and install screws 4.
(item 20) and hex nuts (item 22) . Tighten firmly enough to
compress gasket.
Install short clevis pin (item 3) through the piston rod and 5.
handle securing with washer (item 4) and hairpin clip (item 5).
Install clevis pin (item 7) , flat washer (item 4) and links (item
8) at the pump housing.
Install hose and suction extension tubes as required. Refer to 6.
Safety Precautions step I. on page 3, and Description step E.
on page 3.
General Guide to Morse Drum Hand Pump Applications
Pump
Model item
Construction
(All have some
t316ss)
o-Ring
Mtl.
Gasket
Mtl.
Hose Mtl.
suction
tube
Compatible Liquids*
(General Guide)
26 polyester viton cork-nitrile PVC polyester petroleum products, lube oils*
27-1AE polyester EPDM EPDM EPDM polyester methyl alcohol, ethyl alcohol*
27-4AV polyester viton viton
cross linked
polyeth.
polyester
some napthas*, some aromatics*
28-5BV ryton viton viton
cross linked
polyeth.
teflon
some chlorinated solvents, acids,
aromatics, xylene*
28-6BE ryton EPDM EPDM EPDM teflon
some acids, caustics, ketones,
acetates*
* NOTE: General guide only. Final determination of suitability for use intended or manner of use is responsibility of the user.
Consult Morse for advice on specific liquids if they are not shown here. Please furnish chemical names.
** NOTE: Chemicals may be hazardous. It is the user’s responsibility to take appropriate safety and protective measures.
Specifications subject to change without notice.
CAUtIon: Chemical compatibility of a pump should be CHECKED FOR EACH LIQUID BY CHEMICAL NAME.
See Chemical Compatibility Chart online.