HWH Corporation
(On I-80, Exit 267 South)
2096 Moscow Road
Moscow, Iowa 52760

Phone: (563)724-3396 or (800)321-3494
Fax: (563)724-3408

Business Hours: 8 a.m. - 5 p.m. Central Time (M-F)

The World's Largest Manufacturer
of RV Leveling & Room Extension Systems
School Material


Hydraulic system schematic - 625S leveling w/2 USO rooms - MP70137 A/C
USO mechanism drawing - AP39244 & AP39245
In floor mechanism drawing - AP37202 A/B
Electric system schematic - 625S w/2 USO rooms - MP90315 A/E
Hose swaging information - ML24976
Swaging specs for O4 hose - MI15.2103
Tightening of hose ends - MI95.73
Sensing unit programming - ML31215
Sensing unit adjustment and tolerance - MI15.4550
Electrical connection protection - MI95.54
Pressure test procedure for room cylinder creep out - ML42737
625S yellow light bulletin - MI95.58
Jack retraction times - MI95.53
Jumper bypass to run auto system master and pump relays - MI95.74
Manual valve release nut operation - MP85.999X
625 LED sheets - ML35669
625S repair manual - ML41240
Single touch air leveling operator's manual w/diagrams - ML46484
Synchronizing procedure for setup or repair of room mechanisms with sync. cylinder - ML39247
System Troubleshooting - General questions - Trouble-shooting.pdf