Bush Hog HDTH5, Operator'S Manual

Page: 136 / 174

HDTH 5 & 6 Finish Mower 08/21
Maintenance Section 5-2
© 2021 Alamo Group Inc.
MAINTENANCE
MAINTENANCE
Gearbox Maintenance
The first oil change must be done after 50 hours of working time and then after 400-500 hours of work. Keep in mind
that intense and continuous working conditions will necessitate more frequent oil changes and periodic checks. It is a
good practice to check the oil level every 50-60 hours of work. When changing the oil, detach the mower and driveline
entirely from the tractor. Remove the driveline from the mower. However, depending on the situation and the operator’s
experience, the tools and equipment available, and the area where the oil change is done (in the shop, in the field,
etc.), other procedures may be used provided that the operator is always fully aware of the hazards connected with
this operation.
Never work under the Implement, the framework, or any lifted component un-
less the Implement is securely supported or blocked up to prevent sudden or
inadvertent falling which could cause serious injury or even death. (SG-14)
To change the oil, keeping in mind the preceding safety recommendations, place the mower in a vertical position
(Figure 5-1), or inclined enough so that once the Vent Plug and the 3/8” Check Plug (Figure 5-2) are removed the oil
can drain out of the Check Plug opening. Once the used oil has been completely drained, place the mower back in a
level position and add oil in the Vent Plug opening until it starts to come out of the Check Plug opening. Allow enough
time for the new oil to seep down into the lower housing through the bearings and fill as needed. Put the Vent Plug
and the 3/8” Check Plug back in place when properly filled. For a full oil change, approx. 0.5 liters use EP80W-90
Gear Oil.
The Vent Plug on the housing is for filling, and 3/8” Check Plug on the side is for checking the level (Figure 5-2). To
check the level, simply unscrew the 3/8” Check Plug and see if the oil reaches the lower part of the opening. To fill oil,
remove the Vent Plug and add oil until it starts to come out of the opening for the 3/8” Check Plug. Re-install the Vent
Plug and the 3/8” Check Plug.
Figure (5-1
)
(Figure 5-2)
VENT
PLUG
3/8”
CHECK
PLUG