Hydraulic Hand Pump
Troubleshooting
Page 34
6. Close the By-Pass Valve #7.
NEVER over tighten By-Pass Valve #7. It should only be hand tight and snug.
7. Pull back the Stem and Knob #16A to release the Handle #10.
8. Stroke the Handle #10 several times to check if sealant gets dispensed out of the Giant Buttonhead
Coupler #17G. Fifty (50) strokes should dispense approximately one (1) ounce of sealant.
A stroke is defined by lifting the Handle #10 up until it reaches its full height, waiting one (1)
second and then pull the Handle #10 all the way down.
If no product, or only a small amount of product is dispensed with each stroke, or if fifty (50)
strokes dispenses less than one (1) ounce of product:
i. See
“By-Pass Valve Repair and Replacement”
ii. See
“Pump Piston Repair and Replacement”
NOTE: Place the Giant Buttonhead Coupler #17G into a container or on a rag to catch
sealant as it dispenses out.
9. Visually inspect the Linkage Assembly #11 for any bent or damaged parts and excessive play.
Open the By-Pass Valve #7. Lift the Handle #5 up until it reaches its full height. Examine how far
the Handle #10 can move up and down without the Pump Piston #5C moving. Excessive
movement indicates the Linkage Assembly #11 is badly worn and requires replacing. When
factory tested, there is no noticeable play in the Linkage Assembly #11.
See “Replacing the
Linkage Assembly”.
10. Pull the Handle #10 down and close the By-Pass Valve #7.
It is important that the By-Pass Valve #7 is closed firm but only hand tight before proceeding.
11. Attach the Giant Buttonhead Coupler #17G to the Test Fitting.
IMPORTANT:
If at any time during the remainder of this test, when pressure is generated in the
Hydraulic Hand Pump and the Handle #10 wants to springs back or push up against the stroke, it
indicates a failure in the Check Valve Assembly #6. See
“Repair or Replacing the Check
Valve”
.
IMPORTANT:
If at any time during the remainder of this test, stroking the Handle #10 stops
generating pressure;
i.
Tilt the pump vertically, pointing the Hydraulic Pump Hose Assembly #17 at a downward
angle. If stroking Handle #10 now continues to build pressure, it indicates air has entered
into the hydraulic system.
See
“Bleeding and Filling the Hydraulic Fluid Bag”
instructions on page fourteen (14).
ii.
A faulty Hydraulic Relief Valve #8 can relieve pressure earlier than expected. See
“Relief Valve Replacement”
on page eighteen (18)
.
12. While closely watching the 15,000 PSI Gauge #17B, stroke Handle #10. It should only require one (1) or
two (2) full strokes before pressure begins to builds up. Do not stroke a third (3
rd
) time.
If the 15,000 PSI Gauge #17B indicator needle shows pressure building up, then drops back
down, it indicates a leak in the system. Check the Hydraulic Pump Hose Assembly #17 and the
Test Fitting connection for sealant leaks.
i.
If the Hydraulic Pump Hose Assembly #17 is leaking sealant, repair it as required, and
then retest the pump.
