Hydraulic Oil for Manual Pallet Jack

Frequently Asked Questions

Q: Is GW HO hydraulic oil compatible with all manual pallet jack brands?
A: GW HO hydraulic oil meets ISO VG 46 specifications and works with Yale, Toyota, Crown, Hyster, and Jungheinrich pallet jacks. However, always verify your jack nameplate or service manual. Some older models or those with synthetic-only requirements will specify an alternative. If your manual calls for AW46 or HM46, GW HO is a direct match. Do not mix mineral and synthetic oils in the same system.

Q: What symptoms indicate the hydraulic oil needs replacement?
A: Replace GW HO if you notice a burning smell, dark discoloration (should be amber-clear), foaming when lowering the jack, slow or jerky descent, or temperature above 60 degrees Celsius on the fluid level indicator. Sediment or water droplets in the oil signal contamination. Standard service interval is 500-1000 hours of operation or annually, whichever comes first.

Q: What is the correct fill level and how do I check it on a pallet jack?
A: Fill GW HO to the maximum line on the dipstick or sight glass with the jack mast fully lowered and on a level surface. Overfilling causes foaming and seal damage. Underfilling causes cavitation and inadequate lift pressure. Check cold, before operating. If the jack will not lift a rated load, low oil level is often the first issue to confirm before troubleshooting pump or valves.

Q: Can I use a different viscosity grade of hydraulic oil instead of GW HO?
A: No. GW HO is ISO VG 46, which means it has been tested for viscosity at 40 degrees Celsius. Using VG 32 will cause leakage past seals and slower descent. Using VG 68 will cause sluggish lift speed and pump cavitation, especially in cold conditions. Always use the exact ISO grade specified in your manual. Substituting brands is acceptable only if the replacement meets the same ISO viscosity and performance standard.

Q: How do I safely drain and dispose of old GW HO hydraulic oil?
A: Loosen the drain plug at the lowest point of the reservoir while the jack is fully lowered and cool. Place a drain pan beneath to catch all fluid. Once drained, leave the plug off for 5 minutes to let residual oil drip. Do not pour used oil down drains or into soil. Transport used GW HO to a licensed recycling facility or hazardous waste collection center. Most recycling facilities accept bulk hydraulic oil at no charge or at a small fee.