This document is a service manual for the Toro POWER TRX™ HD Snowthrower, specifically covering models 38890, 38891, 38870, and 38875. These are commercial-grade units designed for snow removal, featuring robust construction and controls.
Function Description:
The Toro POWER TRX™ HD Snowthrower is a powerful machine designed to clear snow. It utilizes a two-stage system, with an auger housing that collects snow and an impeller that discharges it through a chute. The machine features a track drive system for enhanced traction, particularly in challenging snow conditions, and a hydrostatic drive system for smooth speed control. A key feature is the QUICK STICK® chute control, which allows for easy adjustment of the discharge chute's direction and deflector position. The auger gearbox contains a worm gear and helical gear, driven by a clutching belt from the engine, to power the auger and impeller. The track drive system incorporates bypasses in the hydro to facilitate the wheel clutch system.
Important Technical Specifications:
The manual provides detailed specifications for different models:
- Models: 38890, 38891, 38870, 38875
- Clearing Width:
- 71 cm (28 inch) for models 38890 and 38870
- 81 cm (32 inch) for models 38891 and 38875
- Snow Cut Depth: 51 cm (20 inch) across all models
- Engine: 420cc Toro Premium OHV
- Engine Model: LC190FDS (for 38890, 38891) and LC190FDS-1 (for 38870, 38875)
- Starter:
- 120v starters for models 38890 and 38891
- 230v starters for models 38870 and 38875
- Oil Type & Capacity: 0.95 L (32 oz) 10w 30 / 5w 30 Synthetic
- High Idle RPM: 3300 ± 100
- Ignition Coil Air Gap: 0.3-0.5 mm (0.011-0.019 inch)
- Spark Plug: NGK BPR6ES
- Spark Plug Gap: 0.7-0.8 mm (0.028-0.032 inch)
- Fuel Capacity: 4.5 L (1.2 gal)
- Starting: Recoil/Electric
- Throwing Distance: Up to 18.3 m (60 feet)
- Drive System: Hydrostatic
- Scraper: Fixed
- Weight:
- 138 kg (304 lb) for models 38890 and 38870
- 141 kg (311 lb) for models 38891 and 38875
- Length: 160 cm (63 inch) across all models
- Width:
- 74 cm (29 inch) for models 38890 and 38870
- 84 cm (33 inch) for models 38891 and 38875
- Height: 114 cm (45 inch) across all models
- Fastener Torque Specifications: Detailed tables are provided for both Inch Series and Metric Series bolts and screws, including different grades/classes (Grade 1, 5, 8; Class 8.8, 10.9) and their corresponding torque values (in-lb, ft-lb, N·cm, N·m). A note specifies a 25% reduction in torque for lubricated fasteners.
Usage Features:
The snowthrower is designed for ease of use and control. The QUICK STICK® chute control allows for quick and precise adjustment of snow discharge. The hydrostatic drive system offers variable speed control, enhancing maneuverability. The commercial-grade handles and controls are built for durability and operator comfort. The fixed scraper is adjustable, allowing the operator to set its height slightly off the ground to prevent catching on uneven surfaces like pavement cracks.
Maintenance Features:
The manual outlines various service and repair procedures, emphasizing safety throughout.
- Safety Instructions: Comprehensive safety guidelines are provided, covering unexpected engine starting, lacerations, amputations, burns, fires, explosions, asphyxiation, battery injury, inferior parts, bystanders, projectiles, modifications, unsafe operation, electrical shock, hydraulic system, personal protective equipment, tools, lifts/hoists/jacks, and fire extinguishers.
- Engine Maintenance: Procedures for engine removal and installation are detailed, including specific torque requirements for engine mounting nuts (12.25 ± 1.7 N·m or 150 ± 15 in-lb).
- Track Drive System Maintenance: Instructions for track removal and installation are provided, including tightening the rear hex head bolt for track tension to achieve a 9.5 mm (3/8 inch) deflection, and torquing bogey yoke nuts to 47.5 N·m (35 ft-lb).
- Hydrostatic Drive System Maintenance: Procedures for hydro removal and installation are outlined, with specific torque values for securing the rear hydro bracket (6 N·m or 50 in-lb). A caution warns against flipping the snowthrower on the auger housing to prevent hydrostat damage.
- Belt Maintenance: The machine uses a double-V auger drive belt. Procedures for auger belt and traction belt removal and installation are included. Critical torque specifications are given for the engine pulley bolt (40 N·m or 30 ft-lb) and belt guide screws (26 N·m or 20 ft-lb). A caution highlights the importance of cranking the engine when tightening the crank bolt to prevent pinching and damage to the traction belt.
- Control System Maintenance: Instructions for QUICK STICK® replacement, control interlock replacement, deflector cable removal/installation, and shift lever/rod adjustment are provided. Torque specifications for traction cable screws are 6 N·m (50 in-lb).
- Auger Housing Maintenance: Details on the main frame and auger housing assembly, including scraper replacement. The auger gearbox features a horizontal parting line and heavy-duty steel gears.
- Discharge Chute Maintenance: Procedures for chute and face gear cover replacement, and chute gear replacement are covered. The new POWER TRX™ snow blowers are made with steel discharge chutes.
- Troubleshooting: A "GEARS" systematic approach (Gather Information, Evaluate Potential Causes, Assess Performance, Repair, Solution Confirmation) is suggested for diagnosing and solving problems.
- Electrical Schematics: Appendix A includes electrical drawing abbreviations and schematics for models with and without hand warmers, aiding in electrical system diagnostics and repair.
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