Graco 2730H - Manual (Page 14)

Pump Service: 2730B/2730H Model Pressure Washers
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Pump Service: 2730B/2730H Model Pressure Washers
Repair kits are available. See the Parts List, page 18 (2730B) or page 20 (2830H). For the best results, use all parts
in kits.
Follow Pressure Relief Procedure, page 6.
Valves
For a set of six valves, order Valve Assembly Kit
804402.
1. Remove hex plug from the manifold using a 22mm
wrench.
2. Examine o-ring located under hex plug. Replace if
cut or distorted.
3. Remove valve assembly from cavity. The assembly
may come apart!
4. Install new valve, o-ring and hex plug. Torque to 33
ft-lb (45 N
◆m).
Pumping Section
1. Remove capscrews and lock washers from manifold
using a 5mm wrench.
2. Carefully separate manifold from the crankcase. You
may have to lightly tap the manifold with a soft mal-
let to loosen it.
3. Carefully examine each plunger for any scoring or
cracking. Replace as necessary.
Servicing Plungers
1. Loosen plunger retaining nut five or six turns using a
13mm wrench. Push plunger toward the crankcase
to separate plunger and retaining screw.
2. Remove nut from plunger and examine and clean
o-ring, backup ring, and copper bearing/gasket
washer.
3. Remove plunger and flinger from plunger shaft.
Clean parts as necessary.
4. Inspect plunger shaft for oil leaks from crankcase. If
leaking is obvious, replace oil seals. Otherwise, DO
NOT remove these seals because they cannot be
reused. Oil Seal Kits are available for replacing
seals.
5. Lightly grease the flinger (and oil seal if it is being
replaced) on plunger shaft. Then install plunger.
6. Lightly grease the retaining screw and outer end of
the plunger. Place washer, o-ring and backup ring
around screw and install nut through plunger.
Torque to 11 ft-lb (15 N
◆m).
7. Lubricate outside of each plunger. Slide the mani-
fold on the crankcase, being careful not to damage
seals.
8. Install capscrews and washers finger tight. Torque
screws to 8.8 ft-lb (12 N
◆m) following the tightening
pattern in the following figure.
• The following metric wrenches are needed:
5mm, 13mm, and 22mm.
• Drain and refill pump after 50 hours of opera-
tion.
Retorque the plug after 5 hours operation.
CAUTION
To avoid damage to plunger or seals, keep manifold
properly aligned with the ceramic plungers when you
remove it.
If replacing packings, see Servicing V-Packings,
page 15.
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