W-738

Overview

The Hobart W-738 Waterpress carries a dual identity that matters when ordering parts: it is the current name for the machine Hobart originally catalogued as the W-38A. Hobart's own documentation titles it "Model W-738 Waterpress (Formerly W-38A)" and heads every parts breakdown "W-38A Replacement Parts," so parts referenced under either number apply to the same machine. The unit was built by the Hobart Corporation of Troy, Ohio 45374, as part of the company's Food Service Engineered Waste Equipment Systems line — waste-handling equipment developed for professional food service operations.

The factory parts catalog for this model is Form 13060 (5-79) ML. It lists twelve catalog numbers for the family — ML-35036, ML-35037, ML-35038, ML-35039, ML-35040, ML-35041, ML-35042, ML-35043, ML-35044, ML-35045, ML-35046 and ML-35047 — and opens its model list with a 2 H.P. standard chute configuration. The component breakdowns confirm the full spread of builds: motors, sheave sets and V-belts are catalogued for 2 H.P., 3 H.P. and 5 H.P. machines, in both 50 Hz and 60 Hz versions. The catalog divides the machine into major groups — the drive group (motor, sheaves, belts), the pump assemblies, the return pump unit drawn as Illustration PL-16409-2, the discharge unit drawn as Illustration PL-16126, and a compression cone sub-assembly.

Key Features

Three-phase motors in 2, 3 and 5 H.P.

The catalog lists six drive-motor options: 2 H.P. at 200 V, 60 Hz, 3 Ph; 2 H.P. at 230/460 V, 60 Hz, 3 Ph (also covering 200 V, 50 Hz, 3 Ph); and the same two voltage patterns repeated for 3 H.P. and 5 H.P. Each motor group is fastened with four 5/16"-18 x 1" hex head finished bolts, four 5/16"-18 hex finished full nuts and four 5/16" medium lock washers, with a second hardware group of four 3/8"-16 x 1-1/4" hex head finished bolts, four 3/8"-16 hex finished full nuts, four 3/8" medium lock washers and four plain washers listed alongside.

A belt drive matched to horsepower and line frequency

Pump sheaves are catalogued for 2 H.P. at 50 Hz, 2 H.P. at 60 Hz, 3 H.P. at 60 Hz, a shared sheave covering 3 H.P. at 50 Hz and 5 H.P. at 60 Hz, and 5 H.P. at 50 Hz. Motor sheaves mirror the same horsepower/frequency combinations. Three V-belt listings cover the range: one belt serves 2 H.P. (50/60 Hz) and 3 H.P. (60 Hz) machines; a second serves 3 H.P. (50 Hz) and 5 H.P. (60 Hz); a third serves 5 H.P. (50 Hz). Sheave hubs are offered in three bores — 5/8", 7/8" for 2 H.P. units and 1-1/8" for 3 and 5 H.P. units — each supplied with its key.

Left- and right-hand pump assemblies with 5-1/2" impellers

The pump group includes a pump assembly rotating left to right and a second rotating right to left, each supplied complete with its impeller. Replacement impellers measure 5-1/2" in diameter and are catalogued separately — one version for use with the left-to-right assembly and one for the right-to-left assembly. Hose hardware in this group includes a 2" x 4-1/2" long item and two hose clamps.

Return pump unit (Illus. PL-16409-2)

This assembly is broken down across items 1 through 24, with parts catalogued under the C-223625 dash-number series — C-223625-1, -5, -6, -7, -12, -13, -14, -15, -16 and -19 — plus A-222635-2 and A-222635-3. Supporting hardware includes 1/4"-20 x 5/8" hex head finished bolts and sealing washers.

Discharge unit (Illus. PL-16126) with its own motor and gear reducer

The discharge unit is separately motorized. Its "Motor - Water Press" is offered at 200 V, 60 Hz, 3 Ph and at 230/460 V, 60 Hz / 200 V, 50 Hz, 3 Ph, and drives through a gear reducer that includes items 6 through 9 of the illustration. Sealing is handled by oil seals for 1-1/4" and 1-3/4" diameter shafts, and the bearing set pairs a Fafnir #5305-KG ball bearing with a roller bearing cup and cone assembly. Structural and wear parts carry D-223476-1 and D-223476-2, E-222583-1, B-223610, B-223611, B-222431-1, C-216042-1, C-216042-2 and C-223103, with SC-, WL-, NS-, BB-, BR- and FE-series hardware throughout. Mounting hardware includes four 3/8"-16 x 1" hex head finished bolts with 3/8" medium lock washers, plus 1/2"-13 x 2-1/2" hex head finished bolts.

Compression cone sub-assembly

The catalog breaks out a compression cone sub-assembly that includes items 1 through 7 of its illustration, along with 1/4"-20 x 5/8" hex head finished bolts, sealing washers and a 1/8" x 1" x 10-1/2" gasket.

Specifications

• Model: W-738 Waterpress (formerly W-38A)
• Manufacturer: Hobart Corporation, Troy, Ohio 45374
• Product line: Food Service Engineered Waste Equipment Systems
• Parts catalog: Form 13060 (5-79) ML
• Catalog numbers: ML-35036 through ML-35047 (twelve listings)
• Configurations: 2 H.P. standard chute listed; drive components catalogued for 2, 3 and 5 H.P. builds
• Drive motors: 2 H.P., 3 H.P. and 5 H.P., three-phase
• Electrical: 200 V / 60 Hz / 3 Ph; 230/460 V / 60 Hz / 3 Ph; 200 V / 50 Hz / 3 Ph
• Impeller: 5-1/2" diameter, left-to-right and right-to-left versions
• Sheave hub bores: 5/8"; 7/8" (2 H.P.); 1-1/8" (3 and 5 H.P.), each with key
• V-belts: three listings covering 2 H.P. (50/60 Hz), 3 H.P. (50/60 Hz) and 5 H.P. (50/60 Hz) combinations
• Discharge unit motor: 200 V / 60 Hz / 3 Ph; 230/460 V / 60 Hz / 200 V / 50 Hz / 3 Ph
• Discharge unit drive: gear reducer (includes items 6 through 9)
• Discharge unit bearings: Fafnir #5305-KG ball bearing; roller bearing cup and cone assembly
• Discharge unit seals: oil seals for 1-1/4" and 1-3/4" diameter shafts
• Gasket: 1/8" x 1" x 10-1/2"
• Hose hardware: one 2" x 4-1/2" long item; two hose clamps
• Fasteners: 5/16"-18 x 1", 3/8"-16 x 1-1/4" and 3/8"-16 x 1" hex head finished bolts; 1/4"-20 x 5/8" and 1/2"-13 x 2-1/2" hex head bolts; 5/16"-18 and 3/8"-16 hex finished full nuts; 5/16" and 3/8" medium lock washers
• Major illustrations: Return Pump Unit PL-16409-2; Discharge Unit PL-16126

Applications