Exmark Vikingtm Hydro 4500-355 - Manual (Page 26)

Maintenance
Note: Hydraulic reservoir can be pressurized up
to 5 psi to speed this process.
6. If either drive wheel still does not rotate, stop
and repeat steps 4 and 5 above for the respective
pump. If wheels rotate slowly, the system may
prime after additional running. Check oil level as
stated in Check the Engine Oil Level section.
7. Allow unit to run several minutes after the charge
pumps are “primed” with drive system in the full
speed position. Check oil level as stated in Check
the Engine Oil Level section.
8. Check hydro drive linkage adjustment as stated in
Hydro Drive Linkage Adjustment section in
Adjustments.
Wheel Hub-Slotted Nut
Torque Specification
Service Interval: After the first 100 hours
Every 500 hours thereafter
When tightening the slotted nut on the wheel motor
tapered shaft:
1. Torque the slotted nut to 100 ft-lb (136 N-m).
2. Further tighten the nut until the next set of slots
line up with the cross hole in the shaft.
3. Replace cotter pin.
Note: Do not use anti-seize compound on the wheel
hub.
Thread Locking Adhesives
Thread locking adhesives such as “Loctite 242”
or “Fel-Pro, Pro-Lock Nut Type” are used on the
following fasteners:
• Pump sheave setscrews.
• Square head setscrews on hydro pump control
arms.
• OPC lever setscrews.
• Shoulder bolts in ends of speed control crank.
• Sheave retaining bolt in end of engine crankshaft.
• Fuel tank bulkhead fitting threads
Adhesives such as “Loctite RC/609 or RC/680” or
“Fel-Pro Pro-Lock Retaining I or Retaining II” are
used on the following:
• OPC lever hubs and cross-shaft.
Note: Care must be used not to bond the
bearing, next to each OPC hub, to the cross-shaft
which could cause binding of the OPC levers and
erratic operation.
• Fuel tank studs, where studs are inserted into tank.
Mobil HTS Grease (Or
Food-Grade Anti-seize)
Mobil HTS grease (or food-grade anti-seize) is used
in the following locations:
• Between the cutter housing spindle and bearings.
• Between the cutter housing spindle and sheave.
• Under top cutter housing bearing guard.
Copper-Based Anti-seize
Copper-based anti-seize is used in the following
locations:
Between the blade drive and pump drive sheaves and
engine crankshaft.
Dielectric Grease
Dielectric grease is used on all blade type electrical
connections to prevent corrosion and loss of contact.
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