Shindaiwa 357 Service Manual download pdf (Page 111)

Q Shindaiwa Inc. 1995 111

Oil Pumps Section 11

STEP 4. Remove the oil pump, and then

remove the pump elbow and gasket (where

used). (Figure 11.7).

STEP 5. Remove the oil suction tube

(Figure 11.7).

Wash all parts thoroughly in clean solvent, and

then blow dry. Replace any non-repairable

components showing damage or measurable

wear.

■ Inspect the oil pump drive lugs for condi-

tion (tang used on Model 757). Figure 11.8.

■ Carefully inspect the drive (worm) gear for

signs of cracking, deformation, or measur-

able wear, and replace if noted.

■ Gently stretch the oil suction tube, and

discard any tube showing evidence of

hardening, softening, or other deterioration.

Connect a Shindaiwa pressure tester p/n

99909-93 to the inlet (filter) end of the

suction tube. Use a tubing clamp or

suitable plug to block the opposite end of

the tube, and then pressure-test for leaks to

a maximum of 5 psi (Figure 11.9).

■ Inspect the oil tank vent for damage,

clogging, or deterioration.

■ Saw models 488 through 695 draw oil

through a plastic elbow installed beneath

the oil pump in the engine crankcase. This

elbow should be carefully inspected for

possible blockage, and also for any signs

of leakage from the sealing plug at the end

of the elbow (Figure 11.10).

■ Inspect the oil filter screen for damage, and

replace if noted.

IMPORTANT!

A missing or melted oil filter screen may

have been damaged by an engine over-

heat. Check carburetor adjustments. See

also pages 18–21, Engine Seizure.

■ Rotate the oil pump driven gear by hand.

The pump shaft should turn easily and

should reciprocate smoothly in the pump

bore with every shaft revolution. A seized or

otherwise internally damaged pump cannot

be repaired and must be discarded.

■ Carefully inspect the oil pump driven gear

for any signs of worn, chipped, or missing

teeth. If serviceability is doubtful, compare

with new parts.

Figure 11.10 Plastic Elbow (488-695)

Figure 11.9 Leak-testing the Oil Suction Tube

Figure 11.7 Pump and Drive (488 shown)

Inspection

10

20

30

40

50

60

0

.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

0

LUB-53

5 psi

Clamp

Oil Suction

Hose

CLH-73

Figure 11.8 Oil Pump Drive Systems

CLH-72

Drive Lug

Elbow

Suction

Tube

Pump

Drive Gear

Adjuster

Shaft

Pump

Gasket

Oil

Pump

Check for

leakage

Pressure

Tester

Drive Tang

(757 only)

OIL PUMPS

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