Hydraulic Hand Pump
Care and Maintenance
Page 14
Pump Maintenance
In most cases where the Hydraulic Hand Pump is not working properly it is because of a problem with the
hydraulic fluid level. It is recommended that all hydraulic fluid system instructions be performed in a shop
environment to reduce the risk of contamination and spills.
Any type of hydraulic fluid may be used, but DO NOT MIX different types of hydraulic fluid together in the system
and do not reuse any hydraulic fluid. Always use new hydraulic fluid.
ALWAYS wear certified Personal Protective Equipment when working with hydraulic fluids.
The following instructions are based on the Hydraulic Hand Pump Sealant Barrel #3 being empty. If
possible, pump out all remaining product.
Bleeding and Filling the Hydraulic Fluid Bag
Air trapped in the hydraulic system is the most common cause of pump problems and failure. What is important is
to know how the air is getting in. Two most common reasons are from loading the pump and opening the By-Pass
Valve #7 too far.
When loading the pump, it is almost impossible to avoid trapping some air in the Sealant Barrel #3,
especially when using stick or bag products. This air can then be forced past the Piston Assembly #2
and into the hydraulic system when pressure in applied. Sealweld has developed the EZ-LOADER to
help avoid trapping air when loading cartridge type products.
Opening the By-Pass Valve #7 more than one (1) full turn does not increase the speed in which
pressure is relieved. What does happen is the By-Pass Valve O-Ring #7C pulls out enough that it can
be damaged by the threads in the By-Pass Valve #7 cavity and as hydraulic fluid drips out, air is
allowed in. Tightening the By-Pass Valve #7 then traps and forces the air into the hydraulic system.
Over a period of time enough air gets into the hydraulic system to affect the functionality of the
system.
To remove air or to refill the hydraulic system, follow these instructions:
NOTE:
If you have previously performed a maintenance procedure that has instructed you to perform the
“Bleeding and Filling the Hydraulic Fluid Bag”
instructions, the Piston Assembly #2 should be pushed
fully in.
1. Close By-Pass Valve #7 and stroke the Handle #10 at least fifty (50) times.
2. Open By-Pass Valve #7; check the 15,000 PSI Gauge #17B to make sure all internal pressure is relieved
from the system.
3. Remove the head assembly (Sealant Barrel Cap #1 and Hydraulic Pump Hose Assembly
#17) from
Sealant Barrel #3 and place it in a clean spot.
If the head assembly will not unscrew easily, double check to make sure By-Pass Valve #7 is
OPEN. Handle #10 can be used to increase leverage. The stub on the Sealant Barrel Cap #1 fits
into the hole at the end of the Handle #10.
4. Turn the Hydraulic Hand Pump so that Sealant Barrel #3 is pointing down, secure in a pipe vise but leave
enough room under the Hydraulic Hand Pump so the Handle #10 can still be easily inserted into the
Sealant Barrel #3.
5. Let the pump stand for five (5) to ten (10) minutes to allow any trapped air to rise.
Gentle tapping on the Sealant Barrel #3 with a hammer will help any trapped air bubbles to rise.
6. Place a suitable container under the Hydraulic Hand Pump to catch any spilled hydraulic fluid.
7. Remove the Handle #10 from the Fulcrum Assembly #9 and clean off any contaminants such as sand or
dirt.
