I would suggest you contact a Cascade representative & your local factory authorized dealer(s) for the equipment you are operating on these issues. You will need to verify some things like 1.) What make(s), models, year & serial numbers of lifts you are using with complete specs (were the units order with any "special" freezer package or just minimal cold storage features. 2.) What lubricant is in the lift rucks hydraulic system. 3.) Service intervals of equipment & who does it - PM & repair frequency, especially the hydraulic system. 4.) Average amount of time per each hour the units are operated in the freezer & out of the freezer & length of work shifts.
Often a ATF type fluid is used in lieu of hyraulic fluid in freezer applications where the lifts remain in the freezer for extended period & teh whole machine get really cold soaked but when the come out into ambient temps of say 60-70 F the fluid is so thin low viscosity it leaks past the seals. Cold soaked steel will break if you have "Cowboys" but a "stronger" pin might cause a more expensive part to break - again Cascade might be the best source for resolution and if you have "Cowboys" try to verify if you do vs a "maybe". If you definitely do, management needs to take corrective actions to fix - no piece of equipment can live up to abuse at the competitive prices customers are willing to pay.