STG global TANVAC HDV3000, Operator'S Manual

Page: 149 / 329

4
6. PUMP SERVICE GUIDE
6.1. AXD Series Pump
A. Valve Maintenance
1. Using a 17mm wrench, remove the six
valve caps on manifold of pump.
(Fig. A)
2.
Examine the valve cap o’ring for cuts or
distortions. Replace if worn.
3.
Using a needle nose pliers, remove the
riser tube and/or suction and delivery
check valve.
(Fig B) The valve assembly
usually stays together when removing. If
the valve comes apart, use a needle nose
pliers or a reverse pliers. Remove the
o’ring and replace if worn or damaged.
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 a complete
valve change in one pump.
5. Replace old valves by placing assembly in
the valve chamber. Replace riser tube on
top of the check valve where necessary.
Press down firmly on the top of valve
assembly or riser tube with your finger.
(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. Using a 6mm allen head wrench, remove
the four head bolts.
(Fig. E)
2.
With the pump firmly secured, take two
medium sized flat head screwdrivers and
apply pressure to the manifold by prying
between crankcase and manifold.
(Fig. F)
Work around from all sides of the manifold
evenly until it comes off of the pistons.
Keep manifold properly aligned with the
crankcase to prevent damage to the seals
and pistons.
3.
When replacing the manifold, lubricate the
pistons and cylinders with grease. Evenly
press the manifold toward crankcase until
flush
.
Fig. A
Fig. B Fig. C
Fig. D
Fig. E
Fig. F