Exmark FMD604 manual Charge Pump Location

IMPORTANT: Before re-installing new filter, fill it completely with Mobil 1 15W-50 and apply a thin coat of oil on the surface of the rubber seal. Turn filter clockwise until rubber seal contacts the filter adapter. Do not tighten yet.

d)Fill reservoir as stated in Section 5.1.9.

e)Loosen filter 1/2 turn and allow a small amount of oil to leak from the oil filter (this allows air to be purged from the oil filter and supply hose from the hydraulic reservoir). Turn filter clockwise until rubber seal contacts the filter adapter. Then tighten the filter an additional 2/3 to 3/4 turn.

f)Raise the rear of the machine up onto jack stands high enough to raise the drive wheels off of the ground. Run machine to allow any other air to be purged from the hydraulic system and recheck the oil level.

g)If either drive wheel does not rotate, one or both of the charge pumps (located on the top of the main pump as shown in Figure 6) may have lost their “prime”. Refer to Section 5.1.11.

h)Do not change hydraulic system oil (except what can be drained when changing filter) unless it is felt that oil has been contaminated.

Changing oil unnecessarily could damage the hydraulic system by introducing contaminates into the system.

5.1.11Hydraulic system air purge procedure.

Air must be purged from the hydraulic system when any hydraulic components, including oil filter, are removed or any of the hydraulic lines are disconnected.

The critical area for purging air from the hydraulic system is between the oil reservoir and each charge pump located on the top of each variable displacement pump. See Figure 7. Air in other parts of the hydraulic system will be purged through normal operation once the charge pump is “primed”.

FIGURE 7

CHARGE PUMP LOCATION

a)Stop engine and wait for all moving parts to stop. Raise the rear of the machine up onto jack stands high enough to raise the drive wheels off the ground.

b)Check oil level as stated in Section 5.1.9.

c)Start engine and move throttle control ahead to full throttle position. Move the speed control lever to the middle speed position and place the drive levers in the “drive” position.

If either drive wheel does not rotate, it is possible to assist the purging of the charge pump by carefully rotating the tire in the forward position.

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