Repair; Replace Pump Components; Replace Air Motor; Replace Pump Lower - Graco ToughTek M680a Operation - Repair - Parts

Repair

To help avoid serious injury from splashing fluid,
never open a camlock hose or applicator fitting while
there is pressure in the fluid line. See Pressure
Relief Procedure, page 12.

Replace Pump Components

To replace any pump components (excluding the air
motor), perform the pump disassembly and cleaning
procedure. See Disassemble and Clean the Pump
(Daily), page 22.

Replace Air Motor

1. Perform Pressure Relief Procedure, page 12.
2. Note location of small air tube connections on air
motor. Remove the air tubes.
3. Disconnect pump rod (see F
a. Push piston rod protective spring up and away
from coupling assembly (BF1-BF3).
b. Remove clip (BF1) and slide coupling cover
(BF2) up to remove coupling (BF3).
BF2
BF1
F . 40
IG
4. Loosen three tie rod nuts (44), then loosen and
remove tie rods (42) from air motor. See Parts,
page 30.
5. Remove air motor.
6. Align air motor with tie rods (42) then tighten tie rods
to air motor.
7. Tighten tie rod nuts (44).
3A5275B
. 40):
IG
BF3
ti21656a
8. Connect the pump rod. See F
9. Connect small air tubes to air motor.

Replace Pump Lower

Perform this procedure to replace the entire pump lower
with a new or different pump lower. To repair or replace
any internal components in the pump (excluding the air
motor), perform Disassemble and Clean the Pump
(Daily), page 22.
1. Flush the Equipment, page 19.
2. Perform Pressure Relief Procedure, page 12.
3. Disconnect pump lower from hopper.
4. Disconnect material hose from pump lower outlet.
5. Disconnect pump rod (see F
a. Push piston rod protective spring up and away
from coupling assembly (BF1-BF3).
b. Remove clip (BF1) and slide coupling cover
(BF2) up to remove coupling (BF3).
BF2
BF1
F . 41
IG
6. Loosen three tie rod nuts (44), then loosen and
remove tie rods (42) from air motor. See Parts,
page 30.
7. Remove pump lower.
8. Align new pump lower with tie rods (42) then tighten
tie rods to air motor.
9. Tighten tie rod nuts (44).
10. Connect pump rod. See F
11. Connect pump lower to hopper.
Repair
. 40.
IG
. 41):
IG
BF3
ti21656a
. 41.
IG
29