
23
HYDRAULIC SYSTEM
The hydraulic system on your FINN HydroSeeder® is designed to give trouble-free service, when
properly maintained. The most important areas of maintenance are the hydraulic oil and filtration.
The reservoir holds 6 gal (23 L) of ISO Grade 46 Hydraulic Oil. The hydraulic oil should be replaced
per the lubrication schedule or if the oil becomes milky or gives off a burnt odor. The hydraulic oil
filter must be replaced on schedule with a 5 absolute micron filter (FINN part number 023914). The
hydraulic system relief is factory-set at 2,250 psi (15,513 kPa).
PUMP MAINTENANCE
NOTE:
Refer to Figure 6 on page 22 for callouts on pages 23 and 24.
WARNING
Pump maintenance to be done only while engine is not running, and battery cables are dis-
connected. Failure to comply could result in death or serious injury.
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 from 0.030
to
0.045 in.
(0.762
to
1.14 mm).
CAUTION
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 (5) until pump
suction cover hits 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 (5).
4. Back off eight bolts (5B) 3/4 turn.
5. Tighten four bolts (1B) 3/4 turn to 15 lb
-
ft (20 N•m) 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 see if pump impeller turns freely through one revolution.
Figure 7 – Pump Impeller Removal
Not
Here
Pipe
Wrench
PUMP
ENGINE-
CLUTCH