Hey guys, hopefully one or more of you can help me with a question I have. I have a new Gravely ZT HD 52 with 50 hours on it. I checked the fluid level in my hydro reservoirs yesterday and found they each have about an ounce in them. The caps on the reservoirs says "do not top off fluid". Does.. Liquid or Air Cooled Transmission Type Hydro-Gear ZT3100 15W-50 synthetic motor oil (Gravely p/n 00057100) or equivalent Hydraulic Oil Filter Drive Forward Maximum - km/h (mph) 12.9 (8) Reverse Maximum - km/h (mph) 6.4 (4) Page 33 3600 ± 100 Oil Capacity Refer to engine manual. Liquid or Air Cooled Transmission Type Hydro-Gear ZT3100 15W.
May 7, 2013 / Gravely ZT52 HD - Changing hydraulic fluid #10 Tom59 said: I'm buying one so this info is helpful. I'm now going to insist they do my tranny service for free before buying it.. But my wallet is set on the ZT HD 48".. my heart usually wins out. :smile: Click to expand. On Friday I brought home a ZT HD 44. I am using it.. View and Download Gravely 991091 ZT HD60 owner's/operator's manual online.. Fuel Tank and Cap 9. Battery 2. Steering Levers 10. Mower Lift Pedal 3. Hydraulic Oil Reservoir 11. Mower Deck 4. Ignition Switch 12. Mower Lift Lock 5.. Page 34 SPECIFICATIONS Model Number 991084 991090 991091 Model HD 60 HD 44 HD 60 Kohler Engine Kawasaki Engine.