Finn T75 HydroSeeder - Slurry Pump Maintenance; Factory Tolerances and Impeller Clearance; Pump Impeller Cleaning

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CLEANING AND MAINTENANCE (CONTINUED)
SLURRY PUMP MAINTENANCE
NOTE: Refer to Figure 7 for pump part callouts.
Slurry pump 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 pump tolerances, loosen the two clamps on pump suction piping and remove
inlet elbow. Through the pump suction hole, insert a feeler gauge between the pump
impeller (3) and the pump suction cover (1). This measurement on a new pump is between
0.030 to 0.045 in. (0.762 to 1.14 mm).
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 flange of the pump suction cover.
B. IMPELLER CLEARANCE – TO BRING THE PUMP BACK TO PROPER
TOLERANCE, PROCEED AS FOLLOWS:
1. Loosen four bolts (1B) and push pump suction cover (1) into pump casing (4) until pump
suction cover touches the pump impeller (3). Pump impeller should be in full contact with
pump suction cover.
2. Tighten eight bolts (5B), finger-tight. Pump impeller should rub the pump suction cover
and not turn easily through one revolution.
3. Tighten four bolts (1B), hand-tight until they touch the pump casing (4).
4. Back off eight bolts (5B) 1-1/2 turn.
5. Tighten four bolts (1B) 1-1/2 turn and tighten four nuts (1N) to 15 lb-ft (20 N•m).
6. Tighten eight bolts (5B) to 15 lb-ft (20 N•m). Clearance gap should be about 0.040 in.
(1.00 mm). Check to make sure pump impeller turns freely through one revolution.
C. CLEANING
1. To clean pump impeller (3), loosen the two Victaulic pipe clamps and remove suction
pipe assembly. The eye of the pump impeller can then be seen through the pump suction
cover (1) and is readily accessible for cleaning.
2. To further access pump impeller, remove eight bolts (5B) that hold pump suction cover (1)
in place. Remove pump suction cover, being careful not to damage O-ring (2).