To Next Page

To Previous Page

The following is the list of items to check if the equipment is not dispensing the correct ratio. Please note that some

items included in this procedure are not included with all supplied equipment. Please use all safety devices such as

but not limited to gloves and eye protection. When working with solvents do so in a well-ventilated area free of

combustible items. Take every effort not to mar or damage any surfaces that come in contact with materials.

If you suspect the ratio is incorrect and the dispense valve is in good condition, proceed as follows:

 Remove retainer cap and/or mixer nozzle.

 Trigger applicator; two separate beads of material will appear. Dispense each bead into separate cups; compare

for correct volume. If volume is correct with mixer off, metering pumps are worn & need to be replaced.

 If volume is off, remove hoses from dispense valve and trigger applicator. Dispense each material into separate

cups. Compare volume of material dispensed out of material hoses. If volume is correct, the problem is occurring

in the dispense valve. Clean and/or replace seals, o-rings, & packings if necessary.

 If ratio is still not correct, remove hoses at the outlet assembly. Trigger applicator and dispense each material into

separate cups. Compare volume of material dispensed out of outlet assembly. If volume is correct, the problem is

occurring in the material hoses. Clean and/or replace hoses.

 If ratio is still not correct, disassembly and clean pumps. Replace seals & o-rings if necessary.

Other items of note:

 Verify that the air inlet to the tank is in good condition

. The air goes into the tank through the air dryer canister.

Check that the canister has holes in both ends and is not clogged with material. Next, check that the tubing from

the tank to the lid is not blocked. Also, check that the crystals inside the canister (through the little window on the

side) are light blue in color. Replace if pink in color.

 Check for blockages on the inlet side of the pump with the reduced output

. The round inlet block will have to be

taken off the back of the pump. Then, inspect the piping leading from the tank to the inlet block. If a blockage is

found, it may not be necessary to go any farther.

 Clean and rebuild the pump

. Check that the inner and outer gears are tight against each other. [Note: be careful

not to damage the inner pump parts when disassembling or cleaning. Replacement parts for the gerotors are

available only as a complete pump!] *Remove all

crystallized or partially hardened material from all surfaces that

contact the material.

 Check the outlet assembly (the piping between the pump and the hoses) for blockages.

#60065-02: Page #8

RATIO CHECK PROCEDURE

*NOTE: Any material that is left in the machine that is partially or completely hardened, or foreign objects, will

eventually cause a problem somewhere and should never be left in the pump.

AST PCH GMP-025 Series User Manual

Questions and Answers: