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4.1.8 Check hydraulic oil level:
Service Interval: 40 hr.
a) Stop engine and wait for all moving parts to stop.
b) Clean area around hydraulic reservoir cap and remove cap. Oil level
should be to the top of the baffle inside the tank. If not, add oil. Use only
Mobil 1 15W-50 synthetic motor oil. Replace hydraulic reservoir cap and
tighten until snug. Do not overtighten.
NOTE: The baffle is labeled “HOT” and “COLD”. The oil level varies with
the temperature of the oil. The “HOT” level shows the level of oil when it is
at 225° F. (107°C). The “COLD” level shows the level of the oil when it is
a 75°F (24°C). Fill to the appropriate level depending upon the
temperature of the oil. For example: If the oil is about 150°F (65°), fill to
halfway between the “HOT” and “COLD” levels. If the oil is at room
temperature (about 75°F (24°C)), fill only to the “COLD” level.
4.1.9 Change hydraulic system filter:
Service Interval: After First 250 hrs, then yearly thereafter.
Note: Use Exmark Part No. 109-4180 for Summer use above 32°
F (0° C)and
use Part No. 1-523541 for Winter use below 32° F (0° C). (Refer to 2.6.2 for Filter
Specifications.)
a) Place unit on a level surface. Stop engine and wait for all moving parts to
stop. Engage parking brake. Remove key or spark plug wire(s).
b) Carefully clean area around filter. It is important that no dirt or
contamination enters the hydraulic system.
c) Unscrew filter to remove and allow oil to drain from reservoir.
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 4.1.8.
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 4) may have lost
their “prime”. Refer to Section 4.1.10.
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.
4.1.10 Hydraulic 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 4).
Air in other parts of the hydraulic system will be purged through normal operation
once the charge pump is “primed”.