Assisted Observation and Task Participation — Hydraulic and Traction Systems

What This Lesson Is About

During your externship placement you move from the classroom into real machine rooms, pits, and hoistways. Your role is pre-apprentice observer and assistant—not a licensed mechanic—so every hands-on task happens under direct journeyman supervision. This lesson prepares you to make the most of each site visit by knowing what to look for, how to document it, and how to stay safe.

Hydraulic Elevator Systems: Key Points for Observation

Hydraulic elevators use a pump, a power unit, hydraulic fluid, and a cylinder or cylinders to raise and lower the car. During maintenance visits you may assist by:

• Checking fluid level and condition. The journeyman will open the power-unit reservoir or check a sight glass. Note the fluid color and whether it looks cloudy or contaminated. Dark or milky fluid is a flag for water intrusion or degradation.
• Inspecting the pit. After LOTO is confirmed, a visual pit inspection looks for oil accumulation on the pit floor (indicating a cylinder or piping leak), standing water (drainage or groundwater problem), and the condition of pit buffers and stop switches.
• Observing the power unit. Watch how the journeyman checks pressure relief valve settings, listens for pump noise, and tests the lowering valve operation. You are not adjusting valves; you are watching the sequence and taking notes.

Underground single-bottom cylinders present a contamination risk to soil and groundwater. Modern codes require containment measures; note any secondary containment liner or leak-detection system the journeyman points out.

Traction Elevator Systems: Key Points for Observation

Traction elevators move the car by friction between wire ropes and a grooved drive sheave turned by an electric motor. During maintenance visits you may assist with:

• Rope inspection. The journeyman examines each hoist rope for broken wires, kinks, corrosion, and wear at the sheave grooves. ASME A17.1 sets criteria for when ropes must be replaced; your job is to hold the flashlight steady and record what the journeyman calls out.
• Chain inspection (if compensating chains are used). Look for elongation, worn links, and proper lubrication.
• Sheave assessment. The drive sheave and any deflector or secondary sheaves are checked for groove wear, out-of-round condition, and proper rope seating. Uneven grooves cause unequal rope loading and accelerated wear.
• Controller walk-through. Traction elevators use either relay-logic controllers (older, with physical relays and contactors) or solid-state/PLC-based controllers (newer, with printed circuit boards and software-driven logic). When the journeyman opens the controller cabinet, your tasks are to observe, sketch the layout of major components, and label them from memory afterward—never touch live panels.

Lockout/Tagout (LOTO): Your Non-Negotiable First Step

Before any pit entry or inspection task, LOTO must be applied and verified. The sequence is:

1. Identify all energy sources—electrical supply to the motor controller, hydraulic pressure in the system, and gravity (car position).

2. Notify affected personnel.

3. Shut down the equipment using the normal stopping procedure.

4. Isolate energy by opening the main line disconnect or circuit breaker.

5. Apply your personal padlock and hasp to the disconnect; the journeyman applies theirs.

6. Release stored energy—hydraulic pressure must be bled down; capacitors in solid-state controllers can hold charge, so the journeyman verifies discharge.

7. Verify the equipment is de-energized before entry.

Never remove anyone else's lock. Never enter a pit without confirmed LOTO, even for a "quick look."

Personal Protective Equipment (PPE) for Site Work

At minimum, every site visit requires: hard hat, safety glasses, high-visibility vest (if working near building traffic), steel-toed boots, and work gloves for handling tools and rope specimens. In pits with hydraulic fluid on the floor, chemical-resistant boot covers may be required. Follow whatever the employer's site-specific safety plan requires—it takes precedence.

The Daily Field Log

Your field log is both a learning record and the evidence your program coordinator uses to assess your progress. Each entry must be made within one hour of completing the visit while details are fresh. A complete entry includes:

• Date and site address
• Elevator ID or system type (e.g., hydraulic holeless, geared traction, MRL)
• Task description — what was done, in what order
• Tools used — by name (e.g., flashlight, tape measure, clamp meter)
• Safety measures applied — LOTO steps confirmed, PPE worn
• Any code reference discussed — note the topic, even if you do not have the section number memorized

You need at least 35 legible, complete entries covering a variety of both hydraulic and traction tasks to pass the midpoint review. Entries showing any unsafe practice—such as noting pit entry before LOTO was confirmed—will be flagged and must be corrected with a written reflection.

Making the Most of Controller Observations

Sketching a relay-logic panel and a solid-state/PLC panel side by side in your journal forces you to notice the differences: physical contactors and overload relays versus terminal strips, I/O cards, and a processor module. Label what you can confirm on site, then complete the labels from memory and course notes when you return. This exercise builds pattern recognition that pays off on both the NEIEP/IUEC entry assessment and the NAEC CET examination.