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Priming Pump
During operation of VPE model and VPO model with optional lubricant tank,
lubricant from the priming tank lubricates the priming pump. The priming
pump should be operated weekly to cycle fresh lubricant through the
primer. This cycling is of particular importance when using biodegradable lu-
bricant, since the biodegradable properties allow it to break down quickly and
lose its lubricating qualities. On rotary vane primers only, an orifice is in the
lubricant line where it enters the priming pump head, to prevent excessive
amounts of lubricant entering the pump and reducing its performance. Make
sure clean lubricant is used in the priming tank and make sure the orifice is
always open.
Priming Valve
After long service, normal wear of plunger insert, quad ring or O−ring may pre-
vent air sealing of the valve. Replace O−rings and plunger insert if any signs of
leakage are discovered. A repair kit is available from the Waterous Company.
Priming Tank
A vent hole is located in the elbow on top of the priming tank to break the sy-
phon and stop the flow of lubricant after priming. The hole should be kept open
at all times, but do not enlarge it.
Refill priming tank as needed with lubricant.
If dispensing priming lubricant into the environment, always use a biodegrad-
able or non−toxic lubricant. Biodegradable / non−toxic Prime−Safet is avail-
able from Waterous.
NOTE: If 30 weight motor oil is used, it is recommended that a catch pan
be used under the primer to collect the used oil so it can be disposed of
properly.
F−1031, Section 2312
Maintenance Instructions
If priming valve has manual controls, check them monthly to make sure they
operate freely. If rust or dirt cause them to bind, clean and lubricate them.
Once a month, perform the following vacuum test.
Remove all caps except openings without valves. Close all discharge, intake,
drain valves and other similar openings. Operate priming device to create a
vacuum of about 22 in. Hg in pump, then stop primer and engine.
Watch pressure gage; if vacuum drops more than 10 in. Hg in 5 minutes, listen
for air leaks around packing glands, gaskets, valves, etc.
Replace gaskets, repack or otherwise repair source of trouble.
All Waterous priming pumps are factory tested and will draw a minimum of 22
In. Hg vacuum. After prolonged service, the rotor to pump clearance may
increase because of wear, resulting in lower vacuum.
On VPE models, if maximum vacuum falls below 22 In. Hg., readjust rotor end
clearance to 0.008 to 0.011 inches (VPE) by removing shims from between
head and body.
On VPO models, if maximum vacuum falls below 22 In. Hg., inspect primer for
wear of the housing, vanes, rotor and seals. Replace as needed.
Use of rotary vane primers will cause vane wear. If wear is excessive, vacuum
levels will decrease. Periodic replacement of vanes and seals is required to
maintain acceptable vacuum levels. Contact Waterous service for replacement
kits.
Rev: 02/27/06
Manual Controls
Testing
Rotor Clearance Adjustment
Vanes
Page 7 of 10
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