Sumner lifts are simple machines — you can complete every procedure in this manual with the contents of a midsize service tool roll. But three tools (wire-rope cutter, calibrated torque wrench, swage tool) are non-negotiable, and using the wrong substitute is the most common cause of repeat failures.
If you do warranty or fleet service on Sumner lifts, build a dedicated lift-service kit. The list below covers every procedure in this manual.
Sumner's service literature does not publish a comprehensive torque table for every fastener on every lift. Use the values below for general assembly — always defer to a Sumner-published value where one exists for safety-critical fasteners.
| Size (UNC) | Grade 5 · Dry | Grade 5 · Lubricated | Grade 8 · Dry | Grade 8 · Lubricated |
|---|---|---|---|---|
| 1/4"-20 | 8 ft-lb | 6 ft-lb | 12 ft-lb | 9 ft-lb |
| 5/16"-18 | 17 ft-lb | 13 ft-lb | 24 ft-lb | 18 ft-lb |
| 3/8"-16 | 30 ft-lb | 23 ft-lb | 45 ft-lb | 35 ft-lb |
| 7/16"-14 | 50 ft-lb | 35 ft-lb | 70 ft-lb | 50 ft-lb |
| 1/2"-13 | 75 ft-lb | 55 ft-lb | 105 ft-lb | 80 ft-lb |
| Location | Typical Size | Grade | Spec Torque |
|---|---|---|---|
| Cable anchor clip (Crosby-style, 1/8" cable) | 1/4"-20 | Per clip mfg. | 4.5 ft-lb (per clip mfg.) |
| Winch mounting bolts | 1/4"-20 | Grade 5 | 8 ft-lb dry |
| Carriage roller shoulder bolts | 3/8"-16 | Grade 5 | 30 ft-lb dry |
| Pulley sheave shoulder bolt | 5/16"-18 | Grade 5 | 17 ft-lb dry |
| Outrigger leg pivot bolt | 3/8"-16 | Grade 8 | 45 ft-lb dry |
| Caster mounting bolts (5" caster) | 5/16"-18 | Grade 5 | 17 ft-lb dry |
| Caster mounting bolts (8" Roust-A-Bout caster) | 1/2"-13 | Grade 8 | 105 ft-lb dry |
| Fork extension kit (PN 783691) | 3/8"-16 | Grade 5 | 30 ft-lb dry |
| Mast section join hardware | 3/8"-16 | Grade 8 | 45 ft-lb dry |
The detailed reasoning lives on the Maintenance page; this is the one-look version.
| Lubricant | Where | Where NOT |
|---|---|---|
| Light machine oil (3-IN-ONE) | Pawl pivot, ratchet teeth | Brake disc, cable, sheave groove |
| White lithium grease | Caster axles, outrigger pivots, fork pins | Brake disc, cable, mast slide pads |
| Dry silicone spray | Mast slide pads, mast surface | Brake disc, cable, cable terminations |
| Anti-seize compound | Outrigger leg threaded extension shafts | Cable, brake, painted surfaces |
| Thread-locker (medium, blue) | Carriage roller bolts, sheave shoulder bolt | Anchor clip nuts (must be re-checked & re-torqued) |