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Troubleshooting
Problem
Pump does not operate.
Erratic or accelerated operation.
Pump operates on "down" stroke only
(missing "up" stroke).
Pump operates on "up" stroke only
(missing "down" stroke).
Pump is operating but not dispensing
material.
Accessories
• Gland protection sleeve 86218 to increase
life of gland seal, for models 84991 and
84992
• Gland protection sleeve 86216 to increase
life of gland seal, for models 84993 and
84994
• Gland protection sleeve 86217 to increase
life of gland seal, for models 84995 and
84996
• Gland protection sleeve 86215 to increase
life of gland seal, for models 84997 and
84998
• Lube cup 86213 with solvent to prevent
material from drying on pump rod
• Gland protection sleeve 86238 to increase
life of gland seal, for models 85201
Possible cause
Restricted or inadequate air supply.
Obstructed material output.
Pump is not primed.
Insufficient material supply.
Material is too heavy for priming.
Worn or damaged bushing and plunger (26)
or piston check (23, 24 and 26).
Worn or damaged inlet check (34 and 35).
Insufficient material supply. Pump is not
intaking enough material to dispense on
both strokes.
Inlet check (34 and 35 ) is not seating or is
damaged.
Specifications
Pump stroke
Maximum recommended speed (continuous)
Output per cycle:
84991 and 84992
84993 and 84994
84995 and 84996
84997 and 84998
85201
Approximately cycles per gallon (liter)
84991 and 84992
84993 and 84994
84995 and 84996
84997 and 84998
85201
Output at 75 cycles/min:
84991 and 84992
84993 and 84994
84995 and 84996
84997 and 84998
85201
Wetted part materials-steel, brass, copper, polyurethane, nitrile
11
Solution
Check air supply pressure and air hose diameter
(see air motor manual for minimum air supply
hose diameter).
Check output line for restrictions.
Prime pump († Pump priming, page 5
instructions).
Refill material supply.
Lower output with material valve.
Increase pressure to pressure primer (if in use).
Check for inlet restrictions.
Check and replace if needed.
Check and replace if needed.
Check inlet for restrictions. Lower output with
material valve.
Check and replace if needed.
6 in (152 mm)
75 cycles/min
6.1 in
3
(100 cm
3
)
3.7 in
3
(61 cm
3
)
3.0 in
3
(49 cm
3
)
2.1 in
3
(34 cm
3
)
1.3 in
3
(21 cm
3
)
38 cycles/gal (10 cycles/l)
63 cycles/gal (16 cycles/l)
78 cycles/gal (20 cycles/l)
111 cycles/gal (29 cycles/l)
178 cycles/gal (48 cycles/l)
2.0 gal/min (7,5 l/min)
1.2 gal/min (4,5 l/min)
1.0 gal/min (3,7 l/min)
0.7 gal/min (2,6 l/min)
0.4 gal/min (1,5 l/min)
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