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TEST NO. 3: Water Valve Lift (Fig. 24, 25)
If valve lift is too high the valve may not seat correctly.
If valve lift is too small, the pulses may not release
enough pressurized water and the relief valve will open
(wasting energy). Improper valve lift can also result in
high contact stresses and rapid cam wear.
j
High pressure water system components can
cause personal in ury if disassembled incor-
rectly. Discharge water pressure at bleed
valve before attempting any water system
servicing. Open bleed valve slowly and avoid
contact with high velocity water stream.
WARNING
IMPORTANT: A reading of 0.090 to 0.102 does not
guarantee a properly adjusted cam. When in doubt,
inspect cam. A worn cam which has been adjusted
to 0.090 to 0.102 will not perform properly. A worn
cam can cause opening of valve on lead-in portion
of cam in this range.
1. Park machine on a level surface, stop the engine,
engage the parking brake, open the hood and discon
-
nect the engine spark plug wires.
2. Slowly open the high pressure bleed valve allowing
any pressurized water to escape.
3. Remove belt guard to expose the drive shaft.
4. Remove test cap from the feeder manifold and install
Valve Lift Indicator (TOR4007) into this opening. Make
sure dial indicator contacts top of water valve, then zero
out dial indicator.
5. Make sure cam lobe is not contacting follower by
rotating coupling assembly several turns and observing
dial indicator.
6. Rotate coupling, moving cam lobe past cam follower
and observe maximum reading on dial indicator.
Dial indicator should move 0.090 to 0.102. There
should be no movement of dial indicator gauge on
lead-in or lead-out portion of cam.
7. If indicator moves more than 0.102, cam lobe is
probably contacting follower on lead-in portion of cam
and must be adjusted (see Valve Lift Adjustment). If
indicator moves less than 0.090, remove gear case
cover and inspect cam for wear. Use your hand to rotate
coupling to position working cam on top. Visually inspect
top of cam lobe for wear. There is a thin area on this
replaceable cam that does not contact the cam follower.
If cam is worn, a ridge will develop between tip of cam
and unused surface. If the ridge is deep enough to catch
a fingernail, replace the cam (see Gear Case Service).
If cam is not worn, adjust valve lift.
8. Go to step 11 under TEST NO. 2 - Water System
Pressure and Flow.
2
3
1
iLead-n to lead-out is
two (2) rev. of pinion.
Lead-out
Cam lobe Lead-in portion
Figure 24
1. Coupling 2. Cam 3. Follower
Figure 25
1. Valve lift indicator (TOR 4007)
HydroJect 3010 Page 6 - 17 Testing