Repair
3A9013A
5
Repair
Pressure Relief Procedure
1.
Engage the trigger lock.
2.
Shutoff the pump:
a.
For air-powered pumps, close the bleed-type
master air valve.
b.
For hydraulic-powered pumps, close the
supply line shutoff valve first, then close the
return line shutoff valve.
3.
Disengage the trigger lock.
4.
Hold a metal part of the gun firmly to a grounded
metal pail. Trigger the gun to relieve pressure.
5.
Engage the trigger lock.
6.
Open all fluid drain valves in the system, having a
waste container ready to catch drainage. Leave
drain valve(s) open until you are ready to spray
again.
7.
If you suspect the spray tip or hose is clogged or
that pressure has not been fully relieved:
a.
VERY SLOWLY loosen the tip guard retaining
nut or the hose end coupling to relieve pressure
gradually.
b.
Loosen the nut or the coupling completely.
8.
Clear the obstruction in the hose or tip.
Required Tools
•
Set of adjustable wrenches
•
Large pipe wrench
•
2-5/8 in. wrench
•
Torque wrench
•
Rubber mallet
•
O-ring pick
•
Large vise
•
Thread lubricant
•
Thread sealant
Disassemble the Pump Lower
Lay out all the removed parts in sequence, to ease
reassembly.
NOTE: Packing Repair Kits are available. For the best
results, use all the new parts in the kit. Kit parts are
marked with an asterisk, for example (3*). These kits
can also be used to convert the lower to different
packing materials. See pages 12-17.
1.
Flush the pump, if possible. Stop the pump at the
bottom of its stroke. Relieve the pressure, page 5.
2.
Disconnect the lower from the motor. See your
separate pump assembly manual.
3.
Place the lower lengthwise in a large vise, with the
jaws on the outlet housing (7) as shown in F
on the cylinder (8) flats. Loosen, but do not remove,
the packing nut (2).
4.
Unscrew the intake valve (18). Be careful to catch
the intake ball (17) as you remove the intake valve
so it does not fall and suffer damage. Remove the
seal (30). Inspect the ball and seat (D) for wear or
damage.
5.
Unscrew the intake housing (16). The lower
assembly may separate at joint A or joint B.
This equipment stays pressurized until pressure is
manually relieved. To help prevent serious injury from
pressurized fluid, such as skin injection, splashing
fluid and moving parts, follow the Pressure Relief
Procedure when you stop spraying and before
cleaning, checking, or servicing the equipment.
NOTICE
To reduce the possibility of costly damage to the rod
(1) and cylinder (8), always use a rubber mallet to
drive the rod out of the cylinder. Never use a hammer
to drive the rod.
