YAMADA SKR110A50PAL-SL, Instruction, Page: 15 / 20

9
Fig.18
Fig.20
Fig.21
Fig.19
6) Pull out the suction tube, and the connecting stud that connects the
piston rod of the air motor becomes visible. Pull out the spring pin of
the connecting section and unscrew the connecting stud or the
lower pump, and the air motor can be separated from the lower
pump. (Fig.18)
[Disassembling and inspecting the lower pump]
7) Secure the suction tube in a vise and remove the retaining ring
fastening the flange to separate the flange from the suction tube.
8) Set a pipe wrench on the booster cover. Unscrew the suction tube
and remove the split pin, nut and shovel. (Fig.19)
9) Likewise, set a pipe wrench on the valve case and unscrew it. The
valve stopper and the foot valve (a part of the plunger assembly)
can be removed.
10) Pull out the plunger rod from the suction tube by holding it. The
piston and connecting rod assembly can be pulled out. (Fig.20)
11) Pull out the spring pin that connects between the connecting rod
and the plunger, and take out the plunger. Wash the plunger and
check it for blemish and wear. (Fig.21)
＜
NOTE
＞
- The plunger is an assembly for mating with the valve. Insert the foot
valve in the plunger, and check if it can smoothly slide. These two
parts, if they are blemished, must be replaced as an assembly.
12) The portions with which the lower part of the piston and the
connecting stud come into contact form a seat surface. Check them
for blemish. (Fig.21)
13) Wash and check each disassembled part. If any blemish or wear is
found, replace the part with a new one.
14) For assembling, reverse the disassembling procedure.
In particular, perform assembling taking care about the directions of
the foot valve.
[Disassembling the air motor]
The air motor is not easily adjusted at assembly. If an air motor failure is found at [4. maintenance and inspection],
ask the dealer to repair the air motor.