How Should a Parts Manager Handle Improving Hours-Per-RO in the Service Drive

A parts manager improves hours-per-RO by reducing parts-wait time through better forecasting, staging parts before technicians need them, communicating ETAs clearly to the service drive, and catching supply gaps early with your DMS data. The goal is simple: fewer technician minutes spent waiting for parts equals more billable hours per repair order. This means proactive inventory planning, tight coordination with service advisors, and honest conversations about which parts kill your efficiency most.

Why Hours-Per-RO Matters More Than Most Parts Managers Realize

Hours-per-RO is a service-drive metric that cuts right through every excuse. It tells you whether your parts operation is enabling technicians to work or just creating bottlenecks. A lot of parts managers treat this number as someone else's problem—"not my job, that's the service director's thing." That's backwards. Your inventory decisions, your communication speed, and your supplier relationships directly determine whether a tech can keep moving or gets stuck waiting for a brake line.

Here's what's really happening when hours-per-RO drops: technicians are losing productive minutes. Maybe it's 15 minutes here, 20 minutes there, waiting on a part that should have been on the shelf. Multiply that across a week, across all your techs, and you're looking at real revenue loss. A typical 10-tech shop losing even 2 hours per week per technician to parts-wait time is leaving roughly $8,000–$12,000 on the table monthly, depending on your labor rate and shop loading.

The strongest dealerships don't treat parts availability as a nice-to-have. They treat it like the operational spine it is.

How to Forecast Parts Demand Before Jobs Hit the Drive

The magic happens before a customer ever books an appointment. Forecasting isn't guesswork—it's pattern recognition plus data.

Start with your DMS. Pull 90 days of historical ROs and sort by part number. Look for the obvious repeats: brake pads for your top five models, air filters, oil, spark plugs. But also look for seasonal patterns. Northeast shops see salt-damage parts spike in March and April,lower ball joints, tie rods, exhaust components. Summer brings cooling-system work. Fall is tire season.

Once you know the patterns, you can stage inventory before demand hits. If you know a 2016 CR-V with 110,000 miles will almost certainly need a transmission fluid service, and those jobs typically include filter, seal kit, and maybe a solenoid, you can have those parts prepped and ready when the advisor books the appointment.

The second part of forecasting is talking to your service advisors. They're the ones writing the estimates and knowing what's on the books three weeks out. A five-minute daily huddle where the advisor mentions "we've got six timing-belt jobs queued for next week" gives you the heads-up to confirm you've got the belts, tensioners, seals, and gaskets in stock,or to order them with enough lead time.

This kind of coordination is what Dealer1 Solutions was built to handle: parts managers and service advisors sharing the same calendar and RO visibility so nothing gets lost in translation.

Build a Parts-Staging System That Actually Works

Staging parts isn't complicated, but it has to be disciplined. Here's the framework:

• Daily review of the drive schedule: Every morning, your parts staff looks at the ROs scheduled for that day and the next two days. For each job, pull the flagged parts and set them aside in a designated staging area,a cart, a shelf section, or a bin clearly labeled with the RO number.
• Color-code by urgency: Tape or flag parts for jobs starting today in one color. Tomorrow's jobs in another. This prevents someone grabbing a part meant for a job that hasn't started yet.
• Confirm specs before staging: Don't just grab a part because the RO says "oil filter." Verify the vehicle's year, make, model, and engine size. A wrong filter wastes everyone's time and tanks CSI. Spot-check against the vehicle in the drive if you're unsure.
• Set a staging deadline: Parts for today's jobs should be staged and ready by 6 AM. Jobs starting tomorrow by end of shift the day before. This gives you time to catch shortages and order overnight or emergency stock.
• Track what you're pulling: Mark each staged part in your DMS or parts-management system so you're not double-ordering or leaving the shelf short for walk-in customers.

This system only works if everyone follows it. That means training your parts staff on why it matters, not just what to do. Show them the math: a technician earning $35/hour who waits 30 minutes for a part is costing the dealership $17.50 in lost productivity, plus the reputational hit if the customer's waiting too. When your team understands the why, compliance gets better.

Master Your ETA Communication to the Service Drive

A parts manager who can tell a service advisor "your alternator is here, ready to go" or "your alternator arrives Friday, 2 PM" is worth their weight in gold. Vague answers kill schedules.

Set a standard: when a service advisor or technician asks about a part, you respond with one of three things:

1. "In stock, staging now" , The part is on the shelf and will be ready within the next 30 minutes.
2. "On order, arriving [specific date and time window]" , You know the supplier and the ETA. Communicate the window (not just "Friday" but "Friday by 2 PM") so the advisor can plan the job timing.
3. "Sourcing now, will confirm within 2 hours" , You're checking alternate suppliers or dealership stock from another location. Set a deadline for the callback and meet it.

Never say "I'll check." That phrase leaves the advisor hanging and encourages them to double-check with you later, eating up your phone time. And never ghost. If you say you'll confirm in 2 hours, confirm in 2 hours,even if the answer is "can't get it locally, shipping from [city], arrives Thursday."

This is where real-time communication tools matter. A quick SMS or team-chat message to the service drive beats email every time. Email sits in an inbox. A text or chat ping gets answered in seconds.

Use Your DMS Data to Spot and Fix the Biggest Bottlenecks

Hours-per-RO doesn't improve by accident. You have to measure what's actually slowing you down.

Pull a monthly report from your DMS: for each RO, look at the time stamp when the job was booked, when it arrived in the drive, when each part was requested, and when it was delivered. Calculate the gap between "part requested" and "part ready." That's your parts-wait time by job type.

A pattern will emerge. Maybe all your timing-belt jobs are losing 45 minutes to waiting on the belt tensioner. Maybe every alternator job stalls because you're always one part short. Maybe you're ordering specialty fluids from out-of-state and they're arriving after the job's supposed to be done.

Once you've identified the top three or four bottlenecks, attack them:

• For a frequent part with long lead time: Stock it locally. Negotiate a small standing order with your supplier to keep two or three units on hand at all times. The carrying cost is minimal compared to the revenue you're losing to delays.
• For a part that's always one unit short: Increase your par level. If you're stocking one alternator for a 2015 Accord and you're out half the time, stock two. Simple.
• For a specialty item that's hard to source: Find a backup supplier with faster shipping. Or negotiate a core exchange with a shop down the street so you can borrow in emergencies (and return the favor when they need something).

Share these findings with your service director. This isn't blame,it's saying, "Here's where we're losing efficiency, and here's how we fix it together." A service director who sees that the timing-belt bottleneck is costing the shop $1,200 a month in lost hours will probably approve a standing order for tensioners without hesitation.

Coordinate with Service Advisors to Reduce Surprises

One of the biggest hours-per-RO killers is the surprise. An advisor doesn't call out a part need until a technician uncovers a problem during the job. Now you're ordering with zero lead time, and the job sits dead on the lift for hours.

You can't prevent every surprise,that's the nature of diagnostics. But you can catch most of them by being involved in the estimate process.

Make it your business to know what's on the rack before it becomes a problem. When a vehicle comes in for a "check engine light," the advisor should be flagging it to you as a potential diagnostic that might need sensors, coils, or control modules. When a transmission service is booked, you should know it's happening so you can verify you've got the filter, fluid, gasket set, and seals ready.

Some shops do a daily "pre-drive huddle" where the service director, one advisor, and the parts manager walk the schedule together for 10 minutes. You spot jobs with high likelihood of surprises and pre-order the likely parts. Does it waste stock sometimes? Rarely. Most of the time, you're catching real needs and avoiding delays.

The other win: if you're in the huddle, you hear the advisor say, "Customer's got a $1,800 budget for the timing belt." Now you're not sourcing OEM parts that cost $600,you're pricing the best aftermarket options and communicating options to the advisor before the estimate goes out. That's efficiency at the estimate stage.

Track Supplier Reliability and Adjust Buying Accordingly

Not all suppliers are equal. One distributor might promise 2-hour delivery and actually hit it 85% of the time. Another promises next-day and hits it 60% of the time. Your parts-wait time is only as good as your worst supplier.

Keep a simple tracker: for each supplier and each part type, note how often they deliver on their stated ETA. After 30 days, you'll see patterns. The distributor that's reliable for filters and fluids might be terrible for electrical. The OEM dealer might have killer turnaround on transmissions but be slow on trim pieces.

Use this data to adjust your buying strategy. Route high-priority, fast-needed parts through the most reliable supplier, even if it costs slightly more. Use slower suppliers for parts you can order ahead. And if a supplier is consistently missing ETAs, either have a conversation with your rep about performance standards or start sourcing that part category elsewhere.

This is the kind of workflow Dealer1 Solutions was built to handle,tracking parts sourcing, ETAs, and delivery against what actually lands so you can see what's working and what's not.

Frequently Asked Questions

What's a realistic hours-per-RO target for a service drive?

Most dealerships in the 10-20 technician range target 1.8 to 2.2 hours per RO as a baseline, depending on whether you're doing mostly maintenance, heavy diagnostics, or warranty work. Top-performing shops are hitting 2.0 to 2.3, which reflects solid scheduling, good parts availability, and minimal rework. If you're below 1.8, you're either understaffed, overcapacity, or not capturing billable hours. If you're above 2.3, parts delays or technician inefficiency is likely the culprit.

How often should a parts manager review supplier performance?

Monthly at minimum. Pull a quick report showing on-time delivery rate by supplier and part category. If you're only reviewing quarterly, you're missing a month's worth of data that could help you make faster adjustments. Some larger shops review weekly, but monthly is the sweet spot for smaller operations,enough frequency to catch trends without creating busy work.

Should a parts manager be involved in the estimate approval process?

Yes, especially for jobs outside the menu. When an advisor is estimating a transmission fluid service or a timing belt, the parts manager should validate that the estimate includes the right parts and that you actually have them in stock (or can get them in time). This prevents low-ball estimates that require expedited sourcing later. It also catches spec errors,like an advisor pricing the wrong filter or fluid for a vehicle,before it becomes a job delay.

What's the fastest way to reduce parts-wait time if my lead times are already tight?

Increase par levels on your top 10 most-frequently-ordered parts. For a typical shop, this might mean adding one or two units to stock for items like brake pads, air filters, cabin air filters, spark plugs, and belts. The inventory carrying cost is low, and the revenue upside from preventing even two or three job delays per month usually covers it. Start with parts that have short shelf life or high seasonal demand so you're not warehousing slow movers.

How do I know if my parts team is actually staging parts correctly?

Spot-check the drive daily. Walk around 30 minutes before the first job starts and verify that staged parts match the day's ROs and that the specs are correct. Ask a technician, "Did you get the part you needed when you expected it?" once a week. And measure it: track the time between "parts requested" and "parts delivered" in your DMS. If the average is over 45 minutes, your staging system needs tightening or your parts staff needs retraining on the priority system.

What should I do if a supplier consistently misses ETAs on critical parts?

Start by documenting the misses and having a conversation with your supplier rep. Sometimes it's a communication problem, not a capability problem. If the conversation doesn't move the needle after two weeks, start sourcing that part category elsewhere. You might pay slightly more for reliability, but the cost of a job sitting on the lift waiting for parts is way higher than a 5–10% premium on the part itself. Loyalty to a supplier matters only if the supplier is loyal to you.

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