STG global TANVAC HDV3000, Operator'S Manual

Page: 153 / 329

8
6.2 LW/ZW SERIES PUMP
A. Valve Maintenance
1. Using a 22mm wrench or socket, remove
the six valve caps on manifold of pump.
(Fig. A)
2.
Examine the valve cap o’ring for cuts or
distortions and replace if worn.
3. Using a needle nose pliers, remove the
suction and delivery check valve. The valve
assembly usually stays together when
removing. If the valve comes apart, use a
needle nose pliers or a reverse pliers to
remove the remaining parts.
(Fig. B)
4. Inspect the suction and delivery check valve
assembly for general wear and replace if
necessary. The valve assembly consists of
the plastic cage, spring, valve seat, poppet
and o’ring.
(Fig C) One Comet valve kit is
needed for complete valve change of one
pump.
5. Replace old valves with new valves by
placing assembly in the valve chamber.
Press down firmly on the top of the valve
assembly.
(Fig. D)
6.
Replace valve caps by applying LOCTITE
243 to valve cap and torque to 33 ft. lbs.
B. Removing & Replacing Pump Manifold
1.
Remove the manifold of the pump by
taking a 5mm allen head wrench and
removing the eight head bolts.
2.
With the pump firmly secured, take a
medium sized flat head screwdriver and
apply pressure to the manifold by prying
between the crankcase and manifold.
Work around from all sides of the manifold
evenly until it comes off of the pistons.
Keep manifold properly aligned with the
pistons to prevent damage to the seals and
pistons.
(Fig. E)
3.
When replacing the manifold, turn
crankshaft of pump until the top of pistons
are closely aligned. Lubricate the pistons
and cylinders with grease and evenly press
the manifold toward crankcase until flush.
(Fig. F)
Fig. B Fig. C
Fig. D
Fig. F Fig. E
Fig. A