38
CLUMP MAINTENANCE SECTION
NOTE: Refer to Figure 16 for all in-text callouts mentioned.
Clump maintenance should be done only while engine is not running and
battery cables are disconnected. Failure to comply could result in minor or
moderate personal injury. Failure to comply could also result in product or property damage.
A. FACTORY TOLERANCES
1. To check clump tolerances, loosen the two clamps on the pump suction piping and remove
the inlet elbow. Through the pump suction hole, insert a feeler gauge between impeller (7)
and suction cover (1). This measurement on a new clump is between .040 to 045 in. (1.00 to
1.15 mm).
B. IMPELLER CLEARANCE
Tightening of the bolts should be performed in a criss-cross pattern.
DO NOT TIGHTEN OVER 15 lb-ft (20 N•m). Overtightening will crack the
fl ange of the pump suction cover.
TO BRING THE CLUMP BACK TO PROPER TOLERANCE, PROCEED AS FOLLOWS:
1. Loosen four bolts (2) and push suction cover (1) into casing (8) until suction cover touches
impeller (7). Impeller should be in full contact with suction cover.
2. Tighten bolts (5) finger tight. Impeller (7) should rub the suction cover (1) and not turn easily
through one revolution.
3. Tighten bolts (2) to 15 lb-ft (20 N•m). Impeller (7) should turn freely through one revolution.
4. Back off bolts (5) 3/4 turn.
5. Tighten bolts (2) 3/4 turn and tighten nuts (3) to 15 lb-ft (20 N•m).
6. Tighten bolts (5) to 15 lb-ft (20 N•m). Clearance gap should be about 0.040 in. (1.00 mm).
Check to make sure if impeller (7) turns freely through one revolution.
C. CLEANING
1. To clean impeller (7), loosen the two victaulic pipe clamps and remove the suction pipe
assembly. The eye of the impeller (7) can then be seen through the suction cover (1) and is
readily accessible for cleaning.
2. To remove impeller (7), remove eight bolts (5) holding suction cover (1) in place. Remove
suction cover (1), being careful not to damage O-ring (4).
3. Take impeller wrench, which is stored in the toolbox, and position it so that the hole is aligned
with any of the eight tapped holes in the front of the clump casing (8). The 90-degree leg
of the wrench should face in toward the impeller and be positioned between any two of the
impeller fins. Bolt the wrench securely in place with one of the suction cover bolts (5). Using
a pipe wrench on clump shaft (17), unscrew impeller (7) turning shaft in a clockwise direction.
Be careful not to unscrew impeller too far before removing puller wrench.
Do not turn the shaft backward with a pipe wrench. This will unscrew
pump impeller from pump shaft. Consequently, when clutch is engaged
(turned on), the pump impeller will screw onto pump shaft with a force great enough to break
pump impeller. Failure to comply could result in minor or moderate personal injury. Failure to
comply could also result in product or property damage.
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