42
Operation Manual
Filter Cartridge Replacement
1. Relieve pressure from the housing using
the bleed valve then loosen the three eye-
nuts (Figure 56) on the lter cover.
2. Slowly open the cover and capture the
spring (Figure 57) and spring keeper.
3. Remove the lter cartridge.
4. Install the new lter cartridge onto the
guide rod. Ensure the guide rod is correct-
ly seated into the bottom of the housing.
5. Inspect the O-ring and install a new one if
necessary.
6. Place the spring keeper and spring into
place on the end of the lter cartridge.
7. Move the lter cover into position and
tighten the eye-nuts.
8. Prepare the pump for operation and start
the unit. Start a typical blast operation
and record the following:
• Engine rpm
• Gauge pressure on the secondary lter
9. Save this record for monitoring the status
of the secondary lter. Monitor the pres-
sure gauge as more hours of operation
are accumulated on the lter cartridge.
When the pressure on the lter gauge has
dropped approximately 7 to 10 psi (0.48 to
0.69 bar) (with the unit operating at the
same rpm as earlier recorded), the lter
must be replaced.
Switch Adjustment
The differential pressure switch will shut
down the unit when the pressure drop across
the lter is approximately 7 to 10 psi (0.48 to
0.69 bar). If the switch doesn’t close within the
7 to 10 psi (0.48 to 0.69 bar) range, it may need
to be adjusted. Contact Jetstream for switch
adjustment instructions.
Uni-Valve Life
The uni-valve seats can be damaged by dirty
water. It is important to change lters regular-
ly to improve pump performance and prolong
valve life. (Nozzles and bypass cartridges are
also adversely affected by dirty water).
Figure 56: Filter Cover.
Eye Nut
Bleed Valve
Eye Nuts
Cover
Figure 57: Cartridge Removal.
Spring
Keeper
Filter
O-Ring
Inspect uni-valve seats regularly to monitor
condition and lap the valve seats when neces-
sary. Refer to “Valve Lapping” on page 68 for
lapping instructions.
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