1. Disassembly
Before disassembly the pump, make it clean and put the removed parts on the paper
or cloth. Don’t damage the parts.
(a) Hold the pump in a vice by lightly clamping the flange section.
(b) Remove bolts 11, pump cover ⑤, pump body ① (Fig.7-9).
(c) Remove lining plate ⑥, driving gear ② and driven gear ③.
(d) Remove seal ring ⑦ and ring ⑧ from the front and rear covers.
Caution: If the seal ring needn’t be replaced, don’t remove it from the front
cover.
2. Inspection
The disassembled parts except rubber parts should be washed with gasoline.
(a) Pump body inspection (Fig. 7-10)
If the scraping trace is up to 1/2 long of the inner periphery, it indicates that the
bearing and gear shaft are subject to excessive wear, replace the pump body.
(b) Lining plate inspection (Fig. 7-11)
Inspect the contact surface of the lining plate. If the surface is worn or its thickness is
smaller than the specified value, replace the lining plate.
Fig. 7-10 Fig. 7-11
(c) Front and rear cover (Fig. 7-12)
If the inner surface of bushings discolored, replace.
(d) Inspect the driving gear and the driven gear. If they are worn, replace them. (Fig.
7-13)
(e) Replace seal rings, bushing seals, snap rings, oil seals and spring snap rings as
require.
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