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PN 97999-749
NM2304A-X-X (en)Page2of2
PUMP OPTION DESCRIPTION CHART
NM2304A - X 1 - X 1 1
CONTAINER SUITABILITY
PLUNGER TYPE
SPRING ARRANGEMENT
CONTAINER SUITABILITY PACKING MATERIAL
1-
Universal (Stub) C-UHMW-PE (upper and lower)
4- 55 Gallon 3- Glass filled PTFE (upper)
8 - Universal (Stub) (without bung) Virgin PTFE (lower)
9 - 55 Gallon (without bung)
5- Glass filled PTFE / Leather staggered (upper)
A - Stub Follower Plate Virgin PTFE (lower)
B - Universal (Stub) with alternate bung
SPRING ARRANGEMENT PLUNGER TYPE
1- Coil 1- Standard (Carbon Steel)
PACKING MATERIAL
GENERAL DESCRIPTION
The two-ball design provides for easy priming of the lower foot valve.
The doubleacting feature isstandard in allARO industrial pumps.Mate-
rial is delivered to the pump discharge outlet on both the up and down
stroke.
The motor is connected to the lower pump end with a spacer tube and
solvent cup. Thisallows for lubrication of theupper packing gland and to
prevent air motor contamination because of normal wear and eventual
leakage through the material packing gland.
WARNING
HAZARDOUS PRESSURE. Do not exceed maxi-
mumoperating pressureof600 p.s.i.(41.4bar) at150p.s.i. (10.3
bar) inlet air pressure.
PUMP RATIO X MAXIMUM PUMP
INLET PRESSURE TO PUMP MOTOR
= FLUID PRESSURE
Pump ratio is an expression of the relationship between the pump motor area and the
lower pump endarea. EXAMPLE: When 150p.s.i. (10.3 bar)inlet pressure issupplied
to the motor of a 4:1 ratio pump it will develop a maximum of 600 p.s.i. (41.4 bar) fluid
pressure (at no flow) - as the fluid control is opened, the flow rate will increase as the
motor cycle rate increases to keep up with the demand.
WARNING
Refer to general information sheet for additional
safety precautions and important information.
NOTICE: Thermal expansioncan occur when the fluidin the materi-
al lines is exposed to elevated temperatures. Example: Material
lines located in a non-insulated roof area can warm due to sunlight.
Install a pressure relief valve in the pumping system.
Replacement warning label (pn 94520) is available upon request.
TROUBLE SHOOTING
Pump problems can occur in either the air motor section or the lower
pump end section. Use these basic guidelines to help determine which
section is affected. Be sure to eliminate any possible non-pump prob-
lems before suspecting pump malfunction.
Pump will not cycle.
• No pressure to the motor. See motor manual.
• Restricted return lines. Clean obstruction.
• Damaged motor. Service motor.
No material at the outlet (pump continually cycles).
• Check the material supply, disconnect or shut off the air supply and
replenish the material, reconnect.
Material on one stroke only (fast downstroke).
• The lower check may not be seating in the foot valve (see lower
pump disassembly). Remove the check from the foot valve, clean
and inspect the valve seat area. If check or foot valve are damaged,
replace.
Material on one stroke only (fast upstroke).
• The middle packings may be worn (see lower pump disassembly).
Replace the seals as necessary.
Material leakage out of the solvent cup or material appears on the
pump plunger rod.
• Tighten the solvent cup until leakage discontinues. If this procedure
does not aid in stopping the leakage problem, the upper packings
may be worn (see lower pump disassembly). Replace the seals as
necessary.
PUMP CONNECTION - UPPER / LOWER
NOTE: All threads are right hand.
1. Loosen (90571) lock nut and unscrew entire pump from the air mo-
tor. This will expose (94448) adapter (see figure 2).
2. Remove (Y145-2) retaining ring and (90572) connector pin to re-
move pump assembly from the air motor.
3. Remove (Y15-21) cotter pin and (94048) clevis pin to remove
(94448) adapter.
Lower Pump Plunger
Pump Motor
Piston Rod
Y15-21 Cotter Pin
PUMP CONNECTOR DETAIL
Figure 2
94048 Clevis Pin
Y145-2 Retaining Ring
90571 Lock Nut (ref.)
90572 Connector Pin
94448 Adapter
REASSEMBLY
1. Assemble (94448) adapter to air motor rod, aligning through holes.
2. Assemble (94048) clevis pin through hole, securing adapter.
3. Assemble (Y15-21) cotter pin through clevis pin.
4. Assemble (94448) adapter into (90584) plunger, aligning through
holes.
5. Assemble (90572) connnector pin through hole, securing with
(Y145-2) retaining ring.
6. Screw the lower pump assembly to the air motor.
7. Screw (90571) lock nut against air motor base and tighten to 50 - 60
ft lbs (67.8 - 81.3 Nm).