This is copied from the Lippert technical info sheet:
Rev: 01.29.2015 Page 1 TI - 188 Hydraulic Operation Fluid Recommendation
HYDRAULIC OPERATION FLUID RECOMMENDATION
TI-188
HYDRAULICS
Operation Conditions
1. Above Freezing
Note: Operation at air temperatures routinely above 0°C (32°F). *
A. Dexron 3/Mercon ATF
B. Mercon 5 ATF
C. Dexron 6 ATF
D. PetroBlend (Mason City, IA) PHO 0022S (synthetic group 3 base blend)
E. Bellman all temp 22 (Bremen, IN)
F. Or any ATF or hydraulic fluid with a pour point lower than -42°C (-45°F).
*Covers most initial OEM fills
2. Below Freezing
Note: Operation at air temperatures routinely below 0°C (32°F).
A. Mobil 1 full synthetic ATF
B. Royal Purple full synthetic ATF
C. Valvoline full synthetic ATF
D. Amzoil full synthetic ATF
E. PetroBlend (Mason City, IA) PHO 0022S (synthetic group 3 base blend)
F. Bellman all temp 22 (Bremen, IN)
G. Or any ATF or hydraulic fluid with a pour point lower than -42°C (-45°F)
H. Multivis (all temperature) iso 22 hydraulic fluid
I. Or any ATF or hydraulic fluid (conventional or synthetic) with a pour point lower than
-46°C(-50°F).
3. Extreme Cold
Note: Operation at air temperatures routinely below -18°C (0°F).
A. Kendall Glacial Blue
B. Benz oil (Milwaukee, WI) Flomite 530
Or any conventional or synthetic ATF or hydraulic fluid with a pour point less than -57°C (-70°F) and viscosity
less than 2850 cP @ -40°C (-40°F ).
Do not use ATF-TYPE F fluid as it will not allow the seals to work properly.
A couple years ago, I discovered a hose from the pump to the manifold had a bulge, but fortunately was not leaking. I consulted with a friend who wrenches on AG equipment, and he said to bring it over, with the trailer hitched up, all slides and jacks in, he removed the hose, and we took it to a local auto parts store. 20 minutes later, we walked out with a new hose, I think it's 6,000 psi rated, with the correct fittings, and went back to the trailer to install the hose. Cycled the hydraulics a couple times and it's fine. Cost? $20.00