Hydraulic system MK2 routine maintenance
Routine maintenance on the hydraulic lift is minimal but important to avoid costly repairs
Oil & filter
Check oil level before operating tractor. The dipstick is located to the right rear of the operators foot when seated on tractor. The gearbox & differential share the same oil. If necessary top up with a good quality universal tractor oil Grade 15W40. Equivalent to eg: Shell Harvella, BP Supertou. (South African conditions)
The hydraulic pump filter cannot be acessed unless the lift cover is removed.
Routinely change the oil every 500 operating hours (28 litres)
Drain oil by removing both diff & gearbox sump plugs.
Fill oil through filler cap located to the left of the gear levers.
Ensure the gear lever boots are in good condition as this is the point where water gets into the oil.
Grease the nipples on levelling box (2), left leveller (1)
Do not grease the nipples on the lift cover as the grease clogs up the hydraulic pump. The lift shaft gets it's lubrication from "spill". Later model tractors came without these points. Remove the grease nipples and replace with blanking bolts 1/4" UNF by 1/2" long.
Settings & bolts
As the lift cover mechanisms wear with time small alterations to the settings are required to prevent undue stress on the hydraulic system. Importantly a check on the operator to ensure that the system is being used correctly.
Draft control lever
Lever stop control
Position control lever
Ensure lever stop controls are in the correct place. It is important that the position control lever does not move beyond the transport position into "constant pumping" as this will cause the relief valve to operate constanly, heat up & lose spring tension. The constant pumping position is only used for external hydraulics. With the motor running place the draft control lever in the up postion & the position control lever in the trasport position. Stand behind the tractor and ensure that the lift arms have at least 2" (50mm) freeplay until they reach maximun lift. If not, to correct this move the stop control (Red arrow) towards the tractor rear end. Alternatively using a 9/16" spanner loosen the two quadrant adjusting bolts (Yellow arrow) & move the inner plate towards the rear of the tractor.
If there is to much lift arm freeplay reverse the process.
Check all bolts are tight. The 13 bolts holding the lift cover to diff housing 100NM. The four centre bolts which hold the ram cylinder 140NM. Inner check chain bracket 120NM.
The purpose of the check chains is to prevent transverse movement of the lift arms & implements striking the tractors tyres. The weight of a moving implement must be carried by the outer chains. With the lift in the down position manually lift the arms upwards & ensure that the chains do not restrict the upward curve of the lower links. See implement hitching for correct setup.
Quadrant adjusting bolts