Maintenance; Engine; Pump; Nozzles - Graco 3325 HA-DD Operation - Repair - Parts

Maintenance

Engine

The engine instructions that accompany the unit detail
specific procedures for engine maintenance. Following
the engine manufacturer's recommendations will extend
engine life.

Pump

The pump oil must be changed after the first 25 hours of
operation on all units. Once the initial oil change has
been completed, it is recommended the oil be changed
every 3 months or 250 hour intervals. If oil appears dirty
or milky, changes may be required at a greater
frequency. Add pump oil and fill only to the center of the
sight glass or max level on dipstick. Refer to the parts
listing for the correct pump oil. Do not overfill.

Nozzles

Water flow through the spray nozzle will erode the
orifice, making it larger and result in a pressure loss.
Nozzles should be replaced whenever pressure is less
than 85% of the maximum. The frequency of
replacement will depend upon such variables as mineral
content in the water and number of hours the nozzle is
used.
3A6588B

Quick Couplers

There is an o-ring seal inside the female quick couplers.
This o-ring will deteriorate or, if the unit is allowed to
pump without the high pressure hose or nozzle
attached, the o-ring may be blown out occasionally.
Insert a replacement o-ring to correct the leak.
Additional o-rings can be purchased from your dealer.

Belt Tension Adjustment

To maintain peak performance, it may be necessary to
occasionally adjust the belt tension. Perform the
following steps:
1. Remove belt guard and loosen two nuts on each
side of pump.
2. Turn cap screw clockwise until a 1/2 in. (12.7 mm)
belt deflection is noticed between the pulleys.
3. Tighten side nuts.
4. Put a straight edge across both pulleys. If
necessary, loosen one set of pulley screws and
adjust in or out to properly align. Tighten pulley
screws and check tension again.
5. Replace belt guard and tighten fasteners securely.
Maintenance
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