15
NORDSTROM HYPREGUN-PLUS 5Q
Flow Control
Nordstrom Valves
Flow Control
Nordstrom Valves
Troubleshooting Guide
■ Problem: The air motor (1) is operating but sealant is not
being dispensed.
Cause 1: Air is trapped within the down tube assembly.
Solution 1: Bleed the system as described in sections 7 through 9
on page 12 of this manual.
Cause 2: Loose down tube assembly.
Solution 2: Tighten as needed.
Cause 3: Primer rod and foot valve assembly (45) is worn or pitted.
Solution 3: Rebuild the assembly using down tube kit 1900016.
■ Problem: The sealant can is difficult to remove from the follower.
Cause: Dimensional tolerances of the can and follower are restricting
can movement.
Solution: Remove air supply and attach to nipple (57, Section B-B).
Slowly open the relief valve (64) 1/4 turn to allow air to enter
the can. The can will be forced from the follower.
■ Problem: The air motor (1) does not operate when the throttle
valve (3) is opened.
Cause 1: The movement of internal parts of the air motor is restricted
due to debris being entrapped in the motor.
Solution 1: Replace the air motor.
Cause 2: The thin wall of the air motor cyclinder has been
dented thus restricting movement of internal parts.
Solution 2: Replace the air motor.
Cause 3: The nylon air tube (5) is cracked.
Solution 3: Replace the nylon air tube.
Cause 4: Air supply pressure to gun is too low.
Solution 4: Check output pressure of the air supply.
Cause 5: Air passages to air motor are blocked.
Solution 5: Clean air passages of obstructions.
Cause 6: Obstruction in down tube assembly.
Solution 6: Disassemble the down tube assembly (36), clean,
and reassemble.
Cause 7: Down tube assembly not assembled to proper length.
Solution 7: Disassemble down tube assembly and assemble to
proper length by aligning roll pins (38 - two locations).
Cause 8: Metal air tube (91) on the air motor is crushed.
Solution 8: Remove the metal air tube assembly and replace.
■ Problem: The air motor will operate only 1/2 stroke.
Cause 1: The air motor slide valve is worn or damaged.
Solution 1: Install new air motor repair kit 47510.
Cause 2: Obstruction in down tube assembly (36).
Solution 2: Disassemble the down tube assembly, clean,
and reassemble.
■ Problem: The follower movement into the can is restricted.
Cause 1: Can too small.
Solution 1: Use Nordstrom five-quart (4.7 litre) can with welded seam.
Cause 2: Follower wiper (35) is too large.
Solution 2: Install new wiper.
■ Problem: As follower enters can, sealant bypasses the follower O-ring.
Cause 1: Follower wiper (35) is too small.
Solution 1: Install new wiper.
Cause 2: Can is too large or bent.
Solution 2: Use Nordstrom five-quart (4.7 litre) can with welded seam.
Cause 3: Can swells or distorts.
Solution 3: Install can shield (72).
■ Problem: The follower (34) will not go completely to the bottom of
the can.
Cause: The bottom of the cylinders (19) contain water.
Solution: Remove air pressure from the unit, unscrew the cylinders
and drain the water. Dry the cylinders and check for oxidation
before reassembly.
■ Problem: The air motor (1) operates slowly even with 125 psi
(8.6 bar) air supply pressure.
Cause: Air flow is being restricted to the air motor.
Solution: Replace the nylon air tube (5) or the metal air tube (91).
■ Problem: Yoke will not move.
Cause 1: Nipple (7) blocked.
Solution 1: Remove obstruction from air passages making sure the air
supply is of a clean source.
Cause 2: The ram needle valve (8) is closed.
Solution 2: Slowly open the ram needle valve. Once the follower has made
contact with the can, open the ram needle valve to 2-1/2 turns.
Cause 3: The ram needle valve (8) is blocked.
Solution 3: Remove obstruction from the ram needle valve passage.
Cause 4: Air passages in the yoke (12) are blocked.
Solution 4: Clear obstruction from air passages or replace the yoke.
■ Problem: Yoke will not raise or lower evenly.
Cause 1: Cylinder (19) is dry of lubrication.
Solution 1: Introduce a light air tool oil into the air system. Use an oil
which is compatible with rubber to prevent swelling of the
piston packing.
Cause 2: Piston rods (22) are bent or scored.
Solution 2: Replace damaged piston rod(s).
Cause 3: Piston packing (26) has swollen and is too tight
in cylinder (19).
Solution 3: Replace the piston packing.
Cause 4: Piston packing (26) is too tight in cylinder (19) due
to cylinder distortion.
Solution 4: Replace the cylinder.
Cause 5: Air passages of the base (18) are blocked.
Solution 5: Clean air passages using a stiff wire or replace the base.
■ Problem: The yoke will not raise when the air supply is connected to
the nipple (57).
Cause: The restrictor ell assembly (30) air passage is blocked.
Solution: Clean the air passage using a small, stiff wire or redrill
the air passage hole using a #55 wire gauge drill bit.
These troubleshooting tips are provided as a means of assisting the consumer in overcoming difficulties encountered with prolonged use of a
Hypregun-Plus 5Q. Part numbers in parentheses denote illustration numbers as listed on pages 5 and 6 of this brochure.
WARNING: Never attempt to repair a Hypregun-Plus 5Q without first disconnecting the air supply.
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